I'm going to buck the norm and say intake, headers and full 2.25" exhaust, port and polished heads, OS valves, custom ground cams, and maybe a home brew turbo system. That oughta set you up good and only cost a few thousand dollars! 
Nah seriously like it's been said either live with it or swap the damn thing

Nah seriously like it's been said either live with it or swap the damn thing
