Back in the day we used to do this a different way. 360 block, crank, rods, and late model 340 standard bore pistons. At the time was a very cheap way to make a 11.5 / 12 to 1 small block depending how much you milled off the top of the pistons. We did several like this made great power for what it was. Ran as good or better than any comparable chevy or ford small block.