TBI to Stealth Ram Question.

Alright, I currently have the TPI setup on my car, but a buddy of mine has a TBI 355ci that he wants to sell me. It runs 13.5's and has 4k on it. Now, what Im wondering is what kind of improvement would it be to make it a Stealth Ram 355? Just take a wild guess.

We need more info about the engine before we can help. Like what kind of cam and heads are on the 355.