The P heads have a different spark plug angle, so there are header clearance issues and the plugs are a pain to change from what I understand(I've never used them). Regular GT40 heads will work just as well, the difference in power ain't that much really and it'll work with the stock stuff you have, headers/valve covers etc, so for the lack of hassle the regulat GT40's might be worth the slight power loss to you. Some roller rockers wouldn't hurt either, but aren't necessary

 

long tubes are always better as long as u can fit them... U get better low end torque.

 

i have another question not really specific to my hp dilemma. a friend told me that a surplus store not far from my local drag strip has a shed full of nascar tires. wondering if anyone knew the standards on these or if they would be good to use for 1/4 mile? Also i'm worried if stock clutch will hold up to them?

as far a suspension goes, i'm going to change all my bushings to a better material, get koni red shocks for the front, lift bars,andthicker sway barsfrom racer walsh.

 

NASCAR tires are sticky, but they have stiff sidewalls. Better than all-seasons, but no where near as good as drag radials.