OK...So if I stay w/ original 331 (and you are right, it just purrs) what do I do about hydramatic transmission....Does not shift very smoothly & revs up before shift etc...(A modern trans does have appeal). The front suspension needs king pins, bushings & trunions...(What are trunions?) Anyway parts for this look like $500 before labor... (Where can get better price on these type parts?)Do appreciate the disc brake info. Sincere Thank You for your thoughts!