Update- decided to go with THE block (which I have received),at 4.500" bore and 3.915" stroke to net 499". Machine work is being done and engine built by Best Machine, as I'm sure Chuck and Pete will make way more power than I could. Will be using a motor plate to fit a dry sump pump. Still shooting for 950hp+ NA. As of now, I'm inside of a year to have the car built...should be a piece of cake!