help me pick cam re-grind for magnum 360

Personally I Think you're pushing the clearance issue at 528 lift. I degreed my cam at 512 lift and i had less than 30 thou clearance from the top of the valve guide to the bottom of the retainer...According to Hughes their retainers eliminate this problem and allow for cams to 600 lift. I bought the 1110 springs ,retainers and locks for about 160 bucks.

stock magnum valve springs are a waste above 5000