If you're in Oklahoma, farm trucks aren't worth much. If it has wheels other than the RH-5°, the wheels are worth quite a bit, If you can build a nicer 1/2 ton by using the cab, I would consider doing it. If the 248 in the 350 runs, it will make your 150 run a lot better than the 228 and the larger radiator in the 350 is an asset also.