Don't know if this helps, but you might use this as a base line. Here is the factory cam specs for a 1968 Pontiac 350CI, 9.2comp; [email protected]
, 355 [email protected]
It is known as the "254" cam.
2 bbl, 3/4-speed, 3.08/3.23 gears.
Intake Opens 22BTC
Exhaust Opens 72BBC
Valve Overlap 47degrees
Valve Lift .412
Now the base 8.6 Compression 265HP 400CI 2bbl (regular gas)engine uses the same camshaft as the 350CI above.
The HO 350 4 bbl, 10.5 comp, [email protected]
, [email protected]
shows 3.36 gearing for 3/4-speed, and 3.23 for automatic.
The cam used is the "066" cam in the automatics and the "067" for manual transmissions. Also used in the 400CI engines. But, you can see it took advantage of the higher compression and Q-jet carb.
Pontiac factory cams are typically ground on a 113-116 LSA. The Competition Cams XE cams are ground on a 110LSA which seem to work very well with lower compression engines -very snappy and pull strong, just a geeteeohguy mentioned. Had one in my low compression 1972 400CI and it pulled great -I was happy with it all considering. The only draw back is that when it hits maximum RPM, the power drops off noticeably and any more revs of the engine is a waste of time. My cam seemed to drop off about 5600RPM's. I could wind it more, but no real power.
I think you might be pleased with one of these grinds -but just my opinion.
I would talk with Competition Cams on an XE grind for your 350CI. A Pontiac cam is different than a Chevy cam, you don't want the same duration on the intake and exhaust. You need more duration on the exhaust to help with the poorer flow characteristics of the exhaust side. Remember, the more duration you have, the higher into the RPM band the engine will need to go to use the cam. Just have to decide what you want your car to do as no cam does it all.