Slant build / pistons

Charlie, any idea on how crazy my compression would be with that blocked decked so much already? the head is an earlier ( has the spark plug tubes ) with 1.70 & 1.44 valves. it only was milled enough to clean it up .005ish. I realize with out cc'ing the head and getting actual measurement of the piston @tdc its just a guess.
just don't want to be a race gas trailer queen. premium pump would be ok.

sorry, just read your first post. was really hoping to avoid a custom piston if possible. maybe I am better off rebuilding with a different block.