My firebird that I have is currently fuel injected(V-6). The engine that I am dropping in is a different size engine(V-8), which would require me to go and get another wiring harness. I'm not sure which would be better, a carbeurated engine or fuel injected? I just want to do some homework before I get started. Thx!!

What year bird?

87

I'm looking to do a chevy 350 engine. I already have a camaro engine of the same year, which is a 305. But I just want something a little bigger.

You could easily go either way. Just use whatever comes on the 350 you buy. Good call on replacing the 305! Those have a bad reputation.