Looking and buy 1971 GTO 455 HO 4 Speed. Engine Code # does not match. Should have been WC buy is YE. Understand that is 455 HO with automatic. Only made 439 Goats Auto with 455. Did Pontiac use this YE Code on other 455 cu engines? How do I know if present engine in body is a from a GTO with 310 net horses? Need answer ASAP as have not made bid on car. Onwer asking $12,500 95% restored. Hasby Fred Rose - Pontiac GTO Forum