454 Help!

[WicKeD_SS]

Im looking into buying a 454 and need to make sure this is the year I want... 76 Standard Deck Mark IV.... going to stroke it to a 496..... looking for 650 hp in my camaro. It was a two bolt main but was drilled to a 4 bolt with new caps.... is this going to be a problem? Need Help before its sold to someone else!

Thanks