To answer your question of how high can you take a 350?....I'd say high enuff for a good reliable street strip deal...Look at my old 350 which was only punched out 30 over to a 355ci, stock crank and rods and 2 bolt block. a good set of pistons, a proven performance cam(XE274), a great set of heads, eddie intake and prosystems carb..some people said it would be too much for the street....no way, no how....I could have driven cross country with that motor and still rip off high 12's @ the track. If thats what you have, build it if you want...if you have $$ then you could go big cubic inch like I did but get ready to spend some serious dough..my receipts are still in hiding from the 427..lol...Good luck w/whatever you build and enjoy it...just remember its all about the combonation of everything...it snowballs fast...enjoy the ride buddy!!!