66 Barracuda Big Block

Jim Lusk said

I've seen it done with an early A-body without any noticeable cutting. Factory exhaust manifolds were used, but were likely angle milled.

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That would be me. I did it with HP manifolds and I did it with Pro-parts headers. Dont waste your time with headers, HP Manis will be plenty fast unless you plant to run it with J-bars and without inner fenderwells. There is just no room for headers.