What can i do next to my Chevelle?

[tyrell418]

Hey all, im new to the site, and i just wanted to know if i could get some feed back from all of you. Anyway, i have a 1969 Chevelle Malibu, it was a 307, all stock, and i put a high performance 350 small black that came stock with 290 horse. Me and my mechanic put a 4 barrel 700 holley carb on, new fan, a HEI distributor, limited slip posi with 4.10 gears, new upper control arms upgraded the turbo 350 and now its built to the nuts and has an overdrive, flow master 40 series exhaust, and i just bought some headers for it and should be on soon. What i want to know is, since i just bought the engine, and its under warranty for 2 years, what else can i do besides touch the engine to gain performance?