Stock magnum heads cam roll call!

Tim at Hughes assured me it would be ok on my stock magnum heads with their spring kit.
This is from “MagnumSwap.com”
There is a persistent rumor that the Magnum engine will not tolerate camshafts with higher than .520 lift due to retainer/lock to valve guide clearance issues. This is not true. While max lift is related to cam duration and other factors, we are using a .550+ lift cam in our shop car, did not need to flycut the pistons, and have more than the minimum clearance.

However it does go on to say clearances should always be checked.