I know saying this is like beating a drum but...if you want to be able to say "it's a side-oiler" and be truthful about it, then the Shelby block is not for you. It's design is based on an FE but the oiling system is closer to that of a center oiler - not looking for a debate here, talk to the man who designed it - plenty in the archives. Go with an original, Pond or Genesis block for your build.
Any of the builders mentioned will be able to provide an engine that will last for years - the only exception being that Holman Moody referral. In the years here, I can't recall a single owner who has spoke about using them - seriously.
