Jerry- I'm running a cam with 264I/272E @ .050, .680 lift, & 106* lobe separation.
I'm running 9.5:1 compression.
I'm also running an aluminum flywheel.
At 1000 miles valves were still no more than .003 out.
Valvesprings are good for 2000 street miles or 1000 track miles per the cam grinder.
Race carbs will not work. They are not calibrated for part throttle cruise. Race carbs are too lean at part throttle cruise for good drivability with a cam this big. In my case a carb from a good race carb builder with "street" calibration was necassary to make street driving smooth and effortless with no surging, hesitation, or bogging. It will cruise at 2200-2300 rpm and has such a smooth torque curve that you can't tell where the power comes on, it's on everywhere.
With enough cubic inches, the proper port size, and a good carb, drivability does not have to suffer at all.
Mismatch anything and you'll get the results others are describing.
Scott
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