Why not buy a plastic burette from Jes or Summit and measure the CC's of both chambers to get the head volume and the CC's of a piston 1" down in the hole and subtract the volume of a 1" cylinder of that bore to get the piston cc's and just calculate compression? It really isn't that hard to do. Once you have those two numbers you can easily figure compression with just the strock of the crank and the thickness of the gasket. As for checking p-v I consider it essential in any piston or cam swap and it is not too hard to do yourself in your garage.