I THINK ITS A 350 LOL I BOUGHT IT AT THE PARTS SALE AT GLENDALE COMMUNITY COLLEGE THIS MORNING CAME WITH A CRANK ITS A STANDARD BLOCK NEVER BEEN BORED OUT NEED PISTONS OIL PUMP AND A COUPLE OTHER THINGS I GUESS WHAT PISTONS DO YOU GUYS RECOMEND??? ALSO SHOULD I BORE IT???? OR JUST HAVE IT HONED???