holley 4150 carb issues and questions

You didn't say which "purple cam". Does it idle ok in gear? If not, your idle feed restrictions in your
carb may need to be opened up a couple or few thou. If you twist up your distributor to 38° total
will your starter crank the motor ok? That's the first thing I would try. Are you using vacuum adv?
If yes, try it disconnected. Problem is probably in primary metering block, though. You could try an
aftermarket billet block with replaceable restrictions. You will have to measure idle feed and power
valve channel restrictions in existing block with index drills & micrometer to know what size to drill
restrictions to in new block. Good luck.