If you are in the process of machining make sure you have the block square deck and set the pistons at zero deck , 383's need all the help in the compression dept. they can get.
If the pistons don't have valve reliefs make sure you pay attention to piston to valve clearance.
I agree. If you are using the flat top pistons with no valve reliefs, you can't run a large duration cam because of the piston to valve clearance. My old 383 did use the Crower 271HDP cam, and had good mid/upper power to 6,000 RPM. I had a stock converter so it was lazy off the line, I really needs a higher stall converter.
I do like the Lunati Voodoo cams. Had good results with the 262/268 cam in a 400 street engine.
