so I was taking apart an engine I aquired earlier... I got into it, and it had been rebuilt at one point in time. I just want to figure out wha it is I have... for starters the pistons.. they have gm stamped in them, as well as this number 6271096. Are these just stock 350 pistons? ok found these , numbers on the cam... ep6 CWC and it had 274 stamped on the end.