heads ( their are alot of choices .....GT40 Y303 's are cheap right now from numerous places like buyfordracing.com , parkway ford , etc.... ) keep in mind that GT40P heads require exhaust modifications to work right because of the spark plug location also thumperoforangpark.com does a good job on porting the stock heads .....trickflow stage 1 cam is a good cam on stock bottom ends.......then the intake needs to be addressed , pretty much anything is better than stock in this department ....I have a typhoon which is a knock off of the edelbrock RPM intake and it works great and fit great and was about half the price (
www.professional-products.com ) , trickflow and holley have package deals which work really great too but are more expensive .....dont forget the extras you will need too and upgrade to a bigger intake pump ....some say you need to upgrade to 24 lbs injectors but trust me you will be fine ...get an adjustable fuel pressure regulator and if it seems lean you can add some fuel pressure to accomidate it ....hope this helps