Purple Cam Design Question

The difference is the old grinds can make power in a fairly narrow way. You lose low end and vacuum to get horsepower. In the same identical engine, a modern cam will make the same or more horsepower, but you also get things like idle quality, no less loss of low end, and longer flatter power peaks throughout the range. MP cams also are made terribly. The QC is as good as the low bidder can get them. So overall, they work but not as well. I'll spend to get what I need for results, and the base parts mean nothing. If the cam's matched well to the parts, any cam will make power if it's made right.