i have two old chevy 1. 5 ton trucks that i would like to restore and repower. one i want to put a service body on and the other will be used for towing. so what engine and transmision do you all think would give me the most bang for my buck?fuller 6?spicer7 eaton fuller 9?3126 cat?8. 3 cummins?5. 9 cummins?