push rods tube seal replacement, glorified, while I'm in there Options

[r3dplanet]

So, I'm going to pull my motor - a seemingly annual springtime tradition - to do some maintenance. The engine is an EA code 1973 1.7 liter. This time around I'm going to change my pushrod tube seals with some viton seals, replace the oil cooler seals, pull the engine tins and have them powder coated, examine a suspicious exhaust stud, and install the heretofore completely missing cooling flap/thermostat assembly.

Here's my question: While I'm In There would it make sense to modify my rocker arms to accept the 911 swivel foot adjusters? Similarly, I've thought about going to chromoly pushrods. But I'm not sure about this. The only reason for doing so would be an attempt to quiet the valve train. Zero lash with steel pushrods seems like it would make for a quieter engine. But in searching the forums I've read that some who've done this experienced much quieter operation, yet others have reported louder. Plus, I want to change the tubes. It bugs me that every time I'm under the engine my tubes are rusty [insert metaphor here].

What's the current opinion on this? Am I just making work for myself? I'm okay with that, but not if I'm doing something utterly stupid.

Thanks,
Marcus