Just did some measuring- - - - -a stovebolt block should be able to get 4 bolt steel main bearing caps 6 inches wide, fitted to the two center positions, similar to the 4 bolt main bearing small block V8s. That will make the bottom end of the block a lot more rigid, better able to support that long, twisty crankshaft. A 235/261 crankshaft with 3/8" more stroke will be a torque monster, particularly when the added compression of the higher displacement is factored in. No need to wind one to astronomical RPM that the cylinder head design can't support, or do radical stuff with the camshaft.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!