Ok, so after the info I gathered from you guys so far I decided I'm going to make a 383 stroker and use a carbureted intake and TBI adapter. But where can I find a throttle body unit that will support roughly 450 HP?

 

Get either a BBC TBI unit or a Holley 670 CFM unit. Just do some research first on which one to get. The later BBC units used small injectors at high pressure. No room for growth.

The early Holley units used Chrysler injectors which are terrible. Be sure if you get a used Holley that the injector leads exit the injector from the side.

RBob.

 

So an earlier BBC throttle body will handle that much horsepower? I don't mind spending some money on a new one if I need to, I just want the unit to support the power.

 

I got a new 2" tbi and 90# injectors from xtremEFI that was on my hotcam 350(Actually still on). Read up on it and see if it will work for you. It only has about 10k on it.