426 inch+ small blocks

Back in 1970 the engine size limit for racing was 5 liters, what did 99.9% of the people do with the 340 to shrink the size down, smaller pistons by sleeving and making the walls stronger, nope, they used a 3 inch stroke crank and spun the engine to 8,000 rpms plus--and made close to 500 hp like BMW's new high tech engines.

Short stroke engines also have less fiction losses over longer stroke engines.

Its your money, build a 408 stroke SBM or just buy a 400 ci Mopar engine with a 3.38 stroke, that will be able to play with the big boys on the high speed Eways much longer without blowing oil smoke out of the tailpipes.