For emissions to pass, you're most likely going to have to get an emissions computer controlled carb, computer controlled distributor and have the cat and A.I.R. tubes hooked up. I know that carbs are harder to tune than the TBI's but then again, if you can get the TBI to pass emissions without all that stuff, then maybe you can do it with a carb.
I do know though that if you take off the tbi, you'll need to get a different distributor, most likely one that is vacuum advanced, turn off your or unplug your ECM and switch to a different fuel pump...or at least run a regulator that holds 7psi (8-9 is max for a carb without flooding it) as well as the new fuel lines. Beyond that, I can't really think of anything else you'll need other than a carb-based intake manifold. They are different than the TBI models.
