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front pipe, down pipe...

This would be my weapon of choice.

IIRC early years used 3/8 and later 9/16. So yes you will probably need to enlarge the hole in the intake

I think the two small ones are 5/16, I got those at Ace, but had to cut the threads longer. The 3/8 one is a stud with a washer nut on top. I think I cut the head off a bolt and threaded it to make that one. Your manifold probably came with 3/8 for the exhaust flange. I drilled and tapped...

Valid point. No doubt about it - If you can get an original in good condition it's probably your best option. But they are getting harder to find, and it's not a light piece if you've got to pay shipping. Appearance wise the China casting looks good (dimensions, thickness, no obvious defects...

After trying to salvage my original and another I got from a yard I ended up with one from Silver Seal also. Not bad. I did a little cleanup on the casting lines and a few other spots ( like the word China) with a grinder. I believe it is actually same one as Dorman. They also sell the...

Isn't it just a gas cap check for '71? I think there is some variation by state/year, but wasn't much to check on early (pre 75) cars.

VHT Flame proof ceramic coating header paint is good for 1300 and intermittent to 2000 deg. I used their gray primer and flat aluminum.

I just put my manifold studs in the slant head with Permatex High Temp Thread Sealant. Not running yet so can't say how well it works. I saw really small tubes in store, but ordered larger one online from Advance...

I was thinking of it as double 'Why!!' pipe.

That's just nasty. Are the pipes even round? Looks like they are crushed. I don't know much about exhaust design, but ain't flow kinda important? I do know the alphabet OK, and I dont see an 'X' there.