Mike:
I have an '86 basically stock 3.2 w/ low compression on #3 that I'm planning a rebuild for.
If you go to the 911Chips site,
911Chips - Porsche Dyno Runs, there are number of dyno runs for a variety of street and track cars that list the mods made, and then the resulting HP and torque figures.
I'm planning either a twin-plug 10.5:1 3.2 w/ probably 993SS cams or a 3.4 twin-plug w/ the same cams if I can swing the extra cost of the P&C's.
Since I drive my car primarily on the street and b/c of pretty strict laws here in DC, I'm keeping the stock induction and CAT in place hoping to not exceed the OEM emission levels.
Good luck with the rebuild.
John