.030 might be all you can go with that block bore,you might think about installing sleeves and keep your .030 pistons..any engine Ive seen at .060 usually has heating issues..then again,flex hone the bores lightly, clean up the pistons you have with some crocus cloth paper, solvent wash them and drop on a new set of rings, new oil pump..slam it back together and run the piss out of it
