As has been posted here & on other Pontiac forums, you can build a P350 with decent power. There have been several '74 GTO Stockers run in the 11 sec zone, and at least two P350 powered Super Stockers, in the 10's. A Pontiac friend won lots of dirt track races with his home-built P350.
A '74 GTO Stocker was #7 qualifier at this weekend's div 5 race, with an 11.158 ET. That ain't too shabby, for unported factory #46 iron heads, iron intake, 750cfm Q-jet, and a flat tappet cam with only .388/.424 lift. And YES, I know this is a purpose built race car. But, it's powered by an NHRA legal P350.
http://www.classracerinfo.com/Engine...8&MAKE=Pontiac
The problem with the P350 is the small bore size. Nowadays, it makes forged pistons & good head gaskets expensive.
Easy to get well over 400 hp, with a storker assembly. Ace got over 450hp with this 4" stroke build.
https://www.hotrod.com/articles/hppp...-engine-build/
Near factory spec 350HO rebuild made 330hp.
https://www.hotrod.com/articles/hppp...-engine-build/
So, I don't see why a lower CR stock stroke P350 build, with the small Voodoo cam, shouldn't make similar power.
Anybody here have dyno results of their P350 build ?