LA360 compression
What is it that YOU want the engine to do? If you told him you wanted a 700hp small block he may be telling you that you can’t get there with your combination of parts. Alan Prusiensky is well know in pro stock and doesn’t build junk. If you told him you just want a 300hp street engine his opinion might change. How in the hell are KB107s .100 below deck?? That seems strange to me. Are you sure about that measurement?