Stroking a 318 to a 390

My friend may be wishing his could run on 87 octane as well by the time he's done, LOL! We don't know the compression as of yet until it gets back from the machine shop, but with the sum of the parts I inspected when we tore it down, I suspect it's going to be pretty high. He has a few other engines to choose from if this one too radical for his liking, which I actually doubt at this point.