uahhh? ummm? Duh? what\'s the difference between... I must be a real dumbass for asking this question... But I believe my truck has a replacement engine in it.. I just got it recently and the stock numbers don't match up. So ..I'm trying to find out if it's the original stock 305 engine or its a 350 replacement? Whats the significant differences and how can I tell? I'm really, really really sorry for asking this-- but I think it'lll amke the differnce when I go for top and bottom engine parts... (it looks like a 305 to me but the valve covers are not stock and the oil pan isn't stock either) -all comments insults greatly appreciated, i think? d'oh! "You tried your best and you failed miserably.The lesson is, never try"