Need more power, or just an updated powerplant?

Small block 350 with TH350 automatic transmission going into this 1941 Plymouth hot rod. Replacing the original straight 6 flathead and manual transmission

Engine is being outfitted with Holley Sniper EFI, being converted from 6 volt to 12 volt, custom transmission linkage to utilize the factory "three on the tree" shifter for automatic transmission use. This engine should get great mileage and flawless drivability!