magnum v8 exhaust manifolds

Will magnum V8 truck exhaust manifolds work.on a 67 A body w a mechanical clutch linkage? If so what years and trucks do i look for? Any specific casting numbers? How well do they flow.compared to.340 hi po manifolds?

These are way more plentiful than A body 340 hi po castings, and way cheaper too. If they fit close enough i can have an exhaust made to fit them. I plan on using EQ magnum heads on my build.

Im sure theres a lot of folks besides me who would like to know this info.

Thanks in advance
Matt