the GT40Ps would be better but IMO i would get a nice set of aftermarket heads, those iron heads will be restrictive on a 351, and you wont be able to extract all the possible HP from the engine.
a 351 can make alot of power N/A but you need a nice set of heads and a good cam and intake to match.
a 351 can make alot of power N/A but you need a nice set of heads and a good cam and intake to match.
You have to buy swap headers to put a 351 in or use ur existing 302 headers and have ur midpipe swap. It can be done I am sure but not going to be a direct swap for the gt40p heads. U will also have to drill them out to accept larger head bolts if thats not already been stated in this thread (to lazy to go back and re read).