Yes I know if it has???? been rebuilt it could have a flat top. BUT if it hasn't been It will have either a flat top(being a 230) Dished if it's a true Non rebuilt 250 it will have a dished piston.As to what it came out of That didn't or doesn't really matter. IF it hasn't been touched in anyway and IS truly STOCK.
( I have yet to ever see a STOCK flat top 250 Even from any truck)
But yes it would be better to pull the head.Or maybe even the oil pan to be able to check the stroke.
God doesn't like ugly.
