Thanks Quenton. Good summary. At the risk of a long story, I'd be interested in some opinions here.

Car originally had a 350 2 bbl. Sat for 18 yrs in garage while life got in the way. Bought Crower 60917 cam (204/214), Holley 650, RPM intake, and hooker super comps (was to be my son's 1st ride). Found out the block was cracked, but friend building the motor had a '73 455 (4x heads) in his shop, so decided to upgrade. As my son's first ride, felt the current set up was sufficient for the 455 as opposed to different cam, carb, etc.

My friend building the motor installed 1.65:1 roller rockers and at the time, I was not aware of the push rod hole issue.

As fate would have it, my son was t-boned 2 months after the new build, and after a long painful ordeal (3 yrs) with a crooked body shop in Houston, I now have the car back (missing parts and all). By the way, if anyone is interested in a body shop in Houston to NOT take a car to, let me know.

I plan to contact the engine builder to confirm exactly what was done regarding the heads, but thought I'd seek advice from the pontiac experts here as well. Now that the car is mine again, upgrading the cam, carb, rockers, etc. is an option.

Unless I can find a drivers side replacement header (damaged in accident), I'll likely move to long branch manifolds as a start due mainly to clearance issues. Am open for suggestions on cam, carb, rockers, etc. I will also upgrade the rear diff and am leaning towards 3.08. Car will be a weekend/daily driver and would like to keep the A/C.

I realize there are a thousand ways to skin this cat, and have read lots of posts on this site concerning build options. I guess I'm looking for any major concerns with the current setup, and suggestions for improvements.