Mild 360 Magnum Build

Stop-Tilt-recheck
Are these silvolites stock compression height or "destroked" rebuilder pistons?
if destroked you mostly lost your quench
did you measure deck clearance on the stock pistons before you pulled it down? what was it?
and BTW what's wrong with re-ringing the stock pistons?
I'm thinking you will need a thin headgasket and even so may not get down to the .030-040 ideal quench distance
so you may end up needing to deck the block- and if you measured all four corners you know if it's square already LA can be all over the place- IDK about Magnum i hear they are better
I used +.020 KBs in one of my last 360 builds but I think that was an LA block not magnum