360 Magnum building on an existing bottom end

JoePole1 said
Ckeck retainer to valve guide clearance, my magnum has only .20 thousandths clearance with Hughes springs/ retainers from the bottom of the retainer to the top of the valve guide.
, with A 512 lift cam

What heads? I have EQ's and they look good but didn't measure.[/QUOTE]
Stock Unmolested 92 magnum