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FWIW, the desktopdynosim programs are fun and will point the way. They can show the crossover points where more cam, more compression drop off. However, they can't show where it will ping. I don't see you getting into any trouble at 10:1 with aluminum heads and a light car.
The one real mistake I see you about to make is thinking you can run "one of the bigger cams I have stored away" with "a 3.00 diff goes in for a little better gas mileage." That will be a miserable combination. Bigger cams need lower gears. With a 3:00 diff, the engine will at cruise way below the sweet spot and fighting the overlap. Choose one - big cam/low gears or short cam/high gears. For a bigger, peakier cam (230@050" and above) I always choose the highest sustained cruise speed I'm ever likely to be holding and gear for the top of the torque curve there. Whichever way you go, stay with a 180-degree intake.
thnx, jack vines
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