I cant remember if these holes are used for anything or if I can weld them up?

If I remember correctly that is where the plastic "pin" goes thru to hold the sound pad in the engine bay area.

Correct sir. Keeps that big heavy pad from sagging in the engine bay. You can weld them up if you're not going to use a pad or if they wouldn't be useful for something else.

It looks like the stock tar mat is still on the floors. Don't know if you are aware that they often hide rust under it. Good idea to strip the floors on both the driver and passenger side of the tunnel.

Dave

I would weld up the holes and use dynamat or equivalent sound deadening instead of factory pad...on the floor too

Thanks guys, I'll go ahead and weld them up then as I wont be using the soundmat in the engine bay. This is an old picture so the floors have long since been cleaned up and de-rusted.

I am in the same place. forgive me if this sounds dumb but I'm somewhat new to welding. When you say weld them up, what is the best way to do this without blowing a bigger hole? I'm using a MIG welder and I have been practicing. Do you put some "backing" metal on the inside and weld from the engine compartment, then grind and smooth in the engine compartment for a nice finish (which is what I want to try)? Can a good welder start at an edge and fill the hole without burning through and making it bigger? Maybe I should drill some holes in sheet metal and practice welding them shut...

With a length of copper piping, bend over end and flatten. Have a helper hold it from the engine side to use as a backing. The welding won't attach to the copper.

Dave