They called the Eicke motors Podge for a reason. They did'nt start using CGI in the Hemi until the 9 cam bearing blocks came out. The early motors had problems with the main webs cracking. There are 3-5 different versions of heads and blocks out there. The one I have is a second gen,skirted style, 4.678 bore with a 9.085 deck. I have seen pistons as large as 4.740. Don't leave a lot of material between the cylinders.
Bob