MP 292H cam too big?

What kind of heads do you have now? Also what cam were you getting specs from when you came up with your dynamic compression? To get 9.2 dynamic from only 10 or so static means you must have a really mild cam with early intake valve closing. I'm building a 360 Magnum and with around 10.5:1 static comp. I get 8.75 dynamic running the smallest Lunati Voodoo hydraulic cam (#60401, 256/262 dur.). Try looking up the detailed specs for the MP 292 cam, I think it should give you WAY less dynamic compression than you calculated.

About the quench you will have .145" clearance if the pistons are really at zero deck, as simple as chamber depth + gasket thickness +/- distance pistons below/above deck. This much quench will do nothing to improve combustion efficiency... You want about .045-.050" MAX for there to be any effect.