I know this post is getting old, but compnine.com can calculate the rarity of the options. Looks like you got a great car with some great options. I'd put the stock wheels on it but thats me.
ac3-Power drivers seat, 5,197,$305
b2l-350 TPI, 245hp (Z28 coupe only), 3,038, $300
g80-Limited slip rear axle, 7,106, $100
g92-Performance rear axle (Z28 coupe only), 3,056
j65-front and rear disc brakes, 3,645
kc4-engine oil cooler (Z28 coupe only), 3,645
l98-engine designation for the 350 TPI
qlc-245/50ZR16 tires, Z28 coupe only, 3,761, $400
uu8- bose stereo, 2,217
zo3-Heritage appearance package, 8,197, $175
Z28 coupe-5,198
81/bright red-11,059
This link will have the answers your looking for.
http://www.thirdgen.org/forums/history-originality/