David, a flathead block is a flathead block. The only differences I ever noticed was with regard to universal carriers as they used a different manifold which exited near the end. IIRC, trucks and cars were a center collector on the manifolds.
As long as you don't need to be 100% authentic on your resto, I would suggest any crossover that fits will work followed by some custom exhaust work.
On my 12 cab Ford I mad my own crossover pipe for about $5 and some time.
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