I don't think the intake is the issue. Maybe the cam is on the small side for the CI but not that terribly small. Probably has a nice mild idle and good vacuum.
I run a similar 242/248 in a 468 BBC, 30 CI smaller, and makes 600hp but has an excellent set of AFR's on it. The cam acts pretty big in this engine.
To give a Pontiac example, I just built a 455 (467) that has a 239/243 cam, a set of 7F6 heads that were ported, a stock 72 455HO intake on top and dyno'd through a set of untouched RA manifolds (no headers), that made 507/571 on a dyno that I'm told is a bit conservative.
I would expect better from a 496, especially the torque numbers. But can't race dyno's obviously.
How it runs in the car is what I'd like to see.
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