First off you have one of my favorite cars that I always wanted. I take flack from a couple friends cause I always check them out at shows. Now the important stuff #1 does your ride have T-tops? and most importantly does it have the Lightning rod shifter?
Ever consider dropping on a 2BBl TBI setup? like the holley frojection that just replaces the carb.
Also you mentioned the Nascar aero: I just passed a Monte SS aerocoupe today you know.. with the Hatchback ... I remember that thing was heavy as Heck.
found one for sale so others can see what I am talking about.
1987 Monte SS AeroCoupe For Sale
One other comment would be that you may do better with a gear swap to either a 3.08 or a 3.42 depending on how you drive if mostly local low speed then keep your gearing highway I would go with a larger gear. I had the 3.42 in my 85 GN "stock gear" and she was a nice cruiser at about 65 with the 200r4 OD trans. then again it had the little 3.8 turbo not the 307
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*