[Hozer 88GTConv]

Hey Hound,
Call Tony Gonyan at Hocus Pocus in Middleburg and he will tell you exactly what you need to know.
1. Did you upgrade your fuel delivery system? i.e. in-line pump?
What psi are you running at?
FMU's are notorious for running on the rich side, but your smoke is indicative of something like a really solid vacuum leak.
e-mail me if you need the number, its in the phonebook and he knows his stuff. He is a renouned driver/mechanic around here and has plenty of track wins to back it up. (and his shop kicks butt too)