Who says I'm staying with a stock block? The good 59 is probably getting some mild ported 4x,7's and a pair of turbos. Plenty to exceed 1000 HP under 6000 rpm. Probably end up with a 4" Ohio forged crank. So figure maybe 433 ci. Mild efi maybe on old HSD intake. Intercooled pump gas under 6000 rpm. Should live just fine.
I plan on aftermarket block for NA build. 4"stroke 4.255 bore makes for 455 CI. Running different combo possibilities to see what I can do on pump gas. I'll use the heads you don't believe exist
KOOLAID boy.