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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Thanks Jim. That's what i was told by the engine builder. The 400 is smaller than the 413/426/440 blocks. I found a abody BB bell housing for a 66 that should be just enough clearance. Factory exhaust manifolds are the plan as well!