I think he's using a set of std D3ve-a2a heads from elsewhere here Paul, but good question on the "Isky" intake. never seen a Dual Quad Isky intake for the 429-460. Probably made them, but must be the red headed step-child.
I have a cam, and lifters, I'm pulling, haven't yet, from the engine that came in the Moo boat when I bought it. Told by PO (And I beleive him), only ran 20 minutes on the water (Was broke in on a bench), before it hydrualic'd because the putz ran both water outlets to the OT headers and did not use the valve and install a second O/B dump. (Looks like it folded #1 rod like a taco).
It's supposed to be a Comp Cams 268H, But again I cannot confirm this until I pull the engine completely down. Been having too much fun in my free time on the water, lol. Also cannot confirm it's condition, or specs, without a lathe, but I'd bet it's OK.
Then again, listen to Paul, He'll get you headed in the right direction as far as the best combination for what you want.
Ray