I measured my pistons at .070 in the hole on all cylinders? I measured them twice to be sure I was getting an accurate measurement. Block decked possibly? I've seen them cut .010, but.020? I suppose anything is possible in a span of 50 years. No money in the budget for Eddy heads. I have several sets of factory heads at my disposal. 2 sets of 452's, a set of 346's and a set of 516's that have had bigger exhaust valves installed. I know that 516's don't flow as well as the others, but on an engine that won't see more than 5000 rpm, I'm wondering if they might not be a bad choice?