I wish the 240 heads were available when I built my 493. I would go with a hydraulic roller if it's in the budget but a solid flat cam would do the job just make sure you get the EDM style lifters. I have both a Victor and an RPM for my car but I like the RPM better for nice off idle seat of the pants feel. I prefer a Holley style carb but my 800 AVS ran pretty well with the RPM but my plugs showed a lean condition with the OTB tune. I went a little too much with my new cam, 248/ 620 makes nice power over 4000 but it's a little soft down low but the 4-speed helps with a 4.10 gear. I'm running a QuickFuel 1050 annular body and it's really responsive if you decide on a Holley style carb.
Gus