Long tube headers from a C3 corvette or a third gen camaro may fit or only need minor modification.
Big difference from crappy block huggers. Don't waste time money and energy on X H pipe BS when you can build correct long tube headers. Why chop off 50hp and then start asking about how it will ET.
The exhaust system is a very critical part of the whole combo. If you want to get the benefit of all the money you spent
on a roller cam etc etc, don;t choke it with a bad exhaust system,, just cause its easy..