451 motor

I use to run a 451 that made good power...mine was a RB block and I never got a season out of stock block...tried it two different years...mine always cracked in the upper main webbing into the cam bore and to the lower cylinders...bought a Mopar Mega block and ran the same combo for another 3 seasons with normal freshen ups, bearings, rings & etc...this was in the early 2000s to 2005 before diesel was $4 a gal. I raced 2-3 a week...but I think for a basic combination that makes big power and will live (with exception of the block) you can't beat a 4.375 bore x 3.75 stroke set up.
Now days though I think buying a cast iron block is not a good choice. If your spending that kind of money I think an Indy aluminum block is the way to go even though it's more money