Maybe us 500557 owners can copy a page from the hi-po 403 Olds owners and run a halo girdle and a main cap brace that ties into the oil pan rail. It would be cool if we could run 4.21" and 4.25" stoker kits w/ no fear of block breakage as well.
Geno
http://www.jsmachineoldsmobile.com/images/full.JPG