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engine spec 383cui 9.3-9.8 compresion 1969 64cc heads with 2.02 intake and 1.60 exhaust heads fully ported and polished , i dont mind ruff idle , so if i could get some opinions that would be great , was thinking about going with the comp cam that changes 4 and 7 on the firing order
Call your favorite cam grinder and talk to one of the tech guys. They'll give you the best recommendation free of charge.
You are in almost the same situation as I am. 389sbc, 64cc vortecs, 9.1:1, currently running the GM "lukewarm" cam, 218-228 on a 112. Idles nice but lays down @ 46-4800rpms. As I'm going through the traps @ 5000, I'm a sitting duck for the "pros" at my local brackets. I'm seriously considering having a custom hyd. roller made with the following specs: 230-236, .510-.520, 108LSA on a 108 centerline. I figure the extra 12 degrees should carry the curve just enough, with good power production, and a rough but acceptable idle. BTW, although I'm no genius, I do know that the companies will steer you toward a cam with too wide a LSA "for street manners". This will cost you considerable torque below 3500. You posted that you didn't mind a rough idle so why give up power? Just don't go nuts with the duration.