I agree with kwkracing, your definetly limited to what you can do with a tbi set-up, just asking why stay with a tbi? emissions laws?
If your stuck using the tbi, I would go with the vortec heads over anything else.
No sense in spending a bunch of dough on some high flowing heads that you wont be getting the full potential out of, your engine will be kinda like breathing thru a straw.
Goodluck, Charles