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cbmax,
I would definitely get a dyno simulation program. Change one variable at a time and you will be amazed!
In my humble opinion, your engine is starving for air. If you change to a single-plane manifold (Torker, Victor, etc.) you will probably find 30-45 HP. With an engine that size you need ported heads and manifold - even the Edelbrock heads aren't enough. Probably worth another 40-50 HP - seriously.
Play around with the cam timing. FE's respond well to certain mods and not at all to others. If you run bigger valves than 2.09"/1.73" and lift greater than about .600", you get almost no gain.
You also need a cam with longer duration - remember that 469 cid is a big motor. Try to keep the lobe centers greater than 112 degrees and try to keep the overlap less than about 32 degrees. You can accomplish all this by playing around with cam timing on the simulation program.
Good luck.
Brian
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