How to modify my 1979 Firebird Espirit 305 engine

Hello, I would like to keep my car together and matching numbers etc. Is there a way to get my 305 to kick a little butt and what are some of the things to change? Besides getting a new engine :rolleyes:

option 1: a real cam with a matching intake and well tuned carb

0ption 2: true dual exhaust minus the bends over the axle

option 3: higher compression heads with bigger valves and better flow

option 4: flat top forged pistons

option 5: gears

option 6: a 150hp shot of laughing gas