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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3RD Echelon Wksp
1968 M274A5 Mule Baifield USMC
1966 M274A2 Mule BMY USMC
1966 M274A2 Mule BMY USMC
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1943 Converto Airborne Trailer
1983 M1009 CUCV
1957 Triumph TRW 500cc
RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......
OMVA, MVPA, G503, Steel Soldiers
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