Do these

3" Downpipe (Cat or No Cat up to you)
U-Bend Delete
180*/160* T-Stat
PRJ/MSD Wires
Autolite 606's or NGK TR55's
PCM (DHP, Overkill, Intense, or a Custom Tune)
Green Bastard Products Ported Throttle Body/Lower Intake Manifold
HV3 Upper Insert
High Ratio Roller Rockers (1.84's can be used with the stock valve springs)

Any order...it would make your GT Pretty quick