MP .528" solid lift cam questions...

Thats a good cam but it might fall a tad short in a 406 engine,the purple shaft your running already has a fair amount of duration (241 @ .050) so its a bit bigger.I would go the next size up in the lunati (60305) or go with the comp xe285hl,these are designed to build more cilinder psi so they actually build more low end than your current cam and will build a bit more power everywhere in the range.