Gas charged double adjustable from QA-1 or KYB. In a HD non-adjustable stock replacement a 50/50 Bilstien would be your best buy (lasts the life of the car IF
you keep your receipt). I would get toknow the Speedway catalog (they cater more to NASCAR than to the NHRA) and sell a lot of good hardware at reasonable prices.
Your B-body is neither light nor nimble, and suffers from terminal understeer (Which can be balanced with judicious use of the throttle if you build a motor for torque instead of peak horse power). I do not know if you have ever watched the BBC show TopGear but they do not hold American cars in very high esteem, with only the newest LS-x powered EFI fueled cars even getting a grudging "Not bad, but ..." comment out of them. The older B-bodies are not going to be challenging any of the foreign imports in an autocross event (where the turns are often equal to the turning radius for some of these sports cars).
I used to bring my L-88 powered first generation Camaro out to SCAA events just so I could drive other peoples cars and let them get some seat time in my Camaro (it is hard to explain the concept of BBC torque to someone who grew up thinking a 1.3 liter, dual over head camed, four valve per cylinder, engine that has a 15,000 RPM tachometer in the dash is the greatest form of fun on this earth in terms of an automobile). They changed their tune after going from full under steer to spining 360 degree turns due to oversteer by just touching the throttle.
If you are serious about racing in other than a straight line I would recommend Herb Adams' book "Chassis Engineering
Herb was the Chief Engineer at the Pontiac Division of GM in charge of suspension. He was instrumental in the development and introduction of the Trans Am Pontiac based upon the Camaro F-body chassis; but it had different suspension pieces, and used the "Wonder Bar" that stiffend the frame so that it would turn inside of a Camaro on the test track (they still had a Poncho motor under the hood back then so the Camaro caught up on the straight-aways). However if you want to go in a straignt line then read David Morgan's book, "Door Slamers: The Chassis Book