My '71 motor which is standard bore and hasn't been decked as far as I can tell had the pistons at .023"-0.34" above deck, so I think you recall correctly. Some of that variation is in the factory machining of the pistons, rods, and block as well as the regound crank it has. I was planning on running a .065 gasket to get the right spacing, if I just plopped a set of small chamber ProMaxx aluminum heads on it.