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My car came to me with rusted out header collectors. I could not identify the brand, so I replaced them with Hooker Comp. Originally I had no clearance issues, but with a heavy duty idler arm, I found I had to flat spot the tube for a good install and fit. I have no plug issues, first small-block I haven't had plug issues with!
I'm now in the process of replacing the rest of the exhaust, which is becoming a major PITA. I've got the mufflers, hangers and tips, but most guys want $450-750 to bend the pipes! Before I spend that kind of money on a few hours of labor I will go to side-pipes.
Then of course I'll have to upgrade the heads to match the better flow, and play with the intake, and rethink the gearing, and...............
I have Heddman on my 74 small block with no clearance problems at all. I got them coated to help with heat. I use standard plugs with no problems....
Garson