On the "starting back to front" and "fix things that break" note, you have 22 year old suspension, so first step I always recommend is bilstein HD shocks to replace those garbage worn out shocks, and go through your tie rods, ball joints, and front bushings. That will make it ride 100x better and handle better than new. Then let it breathe, with long tubes, ORY and a magnaflow cat back. Flow master catbacks don't flow any better than stock, borla is expensive, and SLP is loud. Then do an LS1 lid or a cold air intake, 1.6 full roller non self aligning rockers, new valvesprings like Alex's springs or Howard's, and 7/16 studs, and a mail order tune, and you can safely spin it to 6300 rpm shifts for best time on the stock heads and cam. A stall and sticky tires should then give you that 12 second pass.