Headers,headers,headers,shorty's

There is nothing that better brings out opinions and/or experience better than:
A which kind of oil? thread
A which kind of cam thread
A which carb thread
A which headers fit thread

But you get all kinds of ideas, on what actually works, and hear a lot of arguments, lol. I have a 70 340 Duster with 30 year old hedmans, that probably weight twice what they used to when new; the cheap pos's, rusted, so much welding to repair leaks, etc. Special made wrench to get to # 5&7 plugs. 1/4" shim under left mount, and shift engine to the right. But not speed bump scrapers.

My point is; I don't think anybody makes a header that fits.