Largest displacement of a factory 440 block?

Anyone know what the largest stroke size I can use in a factory 68' 440 block? I was going to go with a 4.15 stroke but I see 4.25-4.5 and 4.6??? If I use an external oiling system etc. just wondering if I can make a 528 ci out of it or larger if possible instead of the 499 ci. I was planning on. I'm thinking of buiding the stroker this winter and don't know if I can use my block or would need an aftermarket block to go this big?
Adam