In my experience, the Comp Purple Plus cams are better than the original Purple Shafts, and I have had good results with both. We built a 367" (.040" over 360) with FM hyper/cast 4 eyebrow (9:1) pistons and ported "J" heads (2.02" intake valves) and a "292/.508" PP Comp cam using Rhoads V-Max lifters. I felt the cam (duration) was a little too big, so the V-Max lifters gave me a way to calm it some at low RPM. Using modified 273 rockers (1.6 blueprinted ratio), 1 3/4" Hooker headers, and unported RPM (not AirGap) intake and 750 Holley DP, it ran 7.0/6.90s @96-98mph in the 1/8mi in a lightweight A-body chassis. It sounded like a roller cam, and revved willingly to 7000+ with that lifter combo. We shifted at 6800. Also I have a milder 440 with a 284/.484" PP cam in it, they really do work well. I'd like to try that smaller PP 280/.474" myself one day.