Head gasket recommendations for magnum

How far down is the piston in the hole, or is it even with the deck? Get #1 at tdc and measure it. If its beneath the deck I think .050 is too much. Even with a cam that has .490 of lift (which isn't much) you could go to a skinnier gasket.

Correct me if I'm wrong, but don't you want quench to be somewhere between .035-.045? (I.E. piston even with the deck at .000, a gasket between .035-.045 would give you perfect quench and eliminate detonation while running on pump gas. If the piston is higher than the deck, then the gasket thickness should be increased.)

I don't think you'll have valve interferrance with .490 lift, but you do want to check to be sure before you button it up.