Cam selection on 496 stroke ; currently have Howard big moma roller any one using something that might get me into 500hp range?
Eagle 4.5” crank 7.1 rods , mahle pistons 5 angle max ported cast iron E heads with mondello high flow valves 10 degrees locks pac spring set at 1.8 height , .08 in hole comet .40 head gasket with air gap hp850 on top

 

 

500 HP out of 496 CI should be a walk in the part. Even a relatively mild cam in the 230-ish duration range should get you there! My 440 CI build makes 540 hp with a 235/241 cam.
Remember that the huge displacement will tame down the cam characteristics.

That Big Mama cam (518045-09?) should have you well into the 500 hp range. Note that the Rattler cams are specifically designed to have a lopey idle and the install setup is extremely advanced.

Best bet is to talk to a builder to spec out a cam for you. Some of the off-the-shelf grinds have gotten much better over the past couple of decades, but they're still not great. Most manufacturers have better lobes and better combinations available, but they won't invest the R&D into an Olds part number.

It's also important to take into consideration your transmission, rear end ratio, and desired use/performance for the car.