I've been working with another member here on the forum, Charrlie. He recommended the 44cc chamber, which according to the machinist, equated to the (about) .100 cut. The .025 that was taken off of the block deck, was done to remove all of the blemishes that were on it. This engine, had been rebuilt before (crank has been turned .030 and is now polished and balanced with a larger register hole for a bigger torque converter.) and the block had been resurfaced, as the engine I.D. could hardly be read, now you can't see any numbers at all. When I tore the engine down, I found an "all metal," very thin head gasket. I'm going to start assembling it this afternoon, cam going in first.