They make a 1.12 CH flattop and reverse dome, which stroke are you running 4.15 or 4.25? Either way could work, using a BBC 6.700 rod for the 4.25 stroke and deck the block .040 or so to get the depth in the bore you want. All my 400 blocks have wound up around 9.965 or 9.960 to be square and flat anyways. S/F....Ken M