Fuel Line Question, Not stock set up, need impute on better line. Options

[Alphaogre]

Backstory:
So, on my 1970 1.7 which has a dual 44 webber carb set up, I had some fuel line issues at the DE/TT at Chuckwalla Raceway that I was at a couple weeks ago. It was running well all weekend, then we noticed on the end of the first day, and part of the second day it would start to sputter on last portion of the lap, which is a 2.6 mile lap with long sweeping turns.

This being the first time I have driven it this hard for a prolong period (staying in the higher RPMs for 15 to 20 mim), at first I was thinking the fuel pump, which came with the car, might not be able to keep up with the demand. Then my instructor suggested that maybe the gas tank was getting low and the fuel was sloshing to one side or the other. This made sense until I refilled the tank and the same issue came around again. on the 3rd round someone that was behind me mentioned that it looked like something was dripping and smelt like gas behind me.

I got under and noticed that my inline fuel filter was shot. I should have changed it before I left, but it didn't even dawn on me since it was my first track experience. I also notice that it looked like fuel was leaking at what looks to be under where the portion of the "tunnel" would be between the driver and passenger. So, my thought was the line had cracked near or before the fire wall and so obviously I parked it for the day and that was the end of the weekend.

The Question:
I know that with running the carbs, it does not run the standard return line set up. I have also heard that the plastic lines are know to crack due to our modern gas.

My question is...is this line the stock/ standard sender line, or is this some replacement garage engineering? The line, filter, and pump was all on the car when I picked it up. The filter and pump were pretty much brand new.

I have seen some stuff on replacement steel lines and have heard about some kevlar coated rubber lines. I am looking to do more track/ AX stuff, so anything I replace this current fuel line with should be something that I don't have to upgrade again in the future for tech reasons. I am also a huge fan of not catching on fire, so I am looking to fix all this before I run the car again.

Below is a photo breakdown of my sender line. It has been sitting a week or so now, and doesn't seem to be leaking or smell like gas. The tank is still full, so I would assume that it is still being gravity fed to the filter and pump. I don't see any drips on the ground and the bottom of the car is not nearly as wet as it was at the track, it mostly looks like residue at this point.

Out of the tank, one line plugged, one connects to the plastic line.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i187.photobucket.com-14487-1422853642.1.jpeg)

Plastic line comes into the car and front portion of the tunnel.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i187.photobucket.com-14487-1422853643.2.jpeg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i187.photobucket.com-14487-1422853643.3.jpeg)

The fuel line in the back hole between the seats.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i187.photobucket.com-14487-1422853643.4.jpeg)

Line out the back of the fire wall: (Rubber grommet seemed to be missing, likely the cause of the leak) Should have checked it before I left or duing the weekend, I know. (IMG:style_emoticons/default/headbang.gif)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i187.photobucket.com-14487-1422853643.5.jpeg)

The filter:
(IMG:http://www.914world.com/bbs2/uploads_offsite/i187.photobucket.com-14487-1422853644.6.jpeg)

Area that was all wet with fuel at the track, circled in red. It did not feel wet in the car.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i187.photobucket.com-14487-1422853644.7.jpg)

[76-914]

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REGISTRATION INFO IS UP ON THE FIRST PAGE!

Yes, I'm Yelling! (IMG:style_emoticons/default/cheer.gif) (IMG:style_emoticons/default/party.gif) (IMG:style_emoticons/default/cheer.gif)

What's an impute? That's not German for Poontang is it?

[Alphaogre]

(IMG:style_emoticons/default/icon_bump.gif)
REGISTRATION INFO IS UP ON THE FIRST PAGE!

Yes, I'm Yelling! (IMG:style_emoticons/default/cheer.gif) (IMG:style_emoticons/default/party.gif) (IMG:style_emoticons/default/cheer.gif)

What's an impute? That's not German for Poontang is it?

Haha yea, that was a typo, it should have been Impüt - you know, german for imput (IMG:style_emoticons/default/biggrin.gif)