here's the thing, I have an 86'iroc-305, 700r4 and am about to swap for a jasper 350 and thd 350 to put in it what other mods do i need to make as far as emissions and computer?

There is an engine swap forum, so I'll move it there.

Why the TH350? Are you going to use the car primarily for racing?

Otherwise, the particulars depend upon what 305 and 350 you're talking about. More details required.