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First thing I would do with this '37 is yank the LT engine and put in a 0.125" over 308 w/ 3 Weber sidedrafts, Clifford cam and head. Then you would have something to really unique at a car show. Stuffing a SBC in every streetrod is getting really old.
I put a 308 in my '37 Terraplane with automatic, I only trimmed the firewall slightly at the middle above the floot board (black insert) then notched the crossmember under the radiator for the Damper pully. Additionally, I slid the radiator forward and use an electric fan in front of the radiator.