There are TONS of parts for 4th gen Fbody cars. The focus always seems to be on drag racing though. What manufacturers have more of a focus on Sportscar /road racing?

 

Hodgkins suspension, QA-1, BMR, SLP, and Penske racing shocks, the choice of shocks for the 2002 ZL-1 Camaro. Tires - BFG, Nitto, Goodyear F1.
Picture below Drag cars? nope not with zr-275 40 front and rear.. cone killers yes..
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Yeah, stranoparts is a good source. UMI suspension parts, Koni shocks just to add to the list. QA1 appears to have come a long way. My car will be a road car capable of auto cross (auto-x) but with an old motor, stock 6 speed and 10 bolt rear I'm not gonna. Just enjoy driving spirited.

The solid rear axle is better for drag racing but it does fine turning. There are now IRS kits designed for 4th gens for twisty racing. Heidt's.