I remember it being a 3.79 crank. R3 block, stock 340 bore. It was the only available forged crank as I remember at the time I had this motor built. Hensley (bought out Herb McCandless) actually built this motor for me around Yr 2000 or so. I swapped his cam for MP .620" flat tappet mechanical cam/my valve springs shortly thereafter. I have a notebook from Hensley. I will need to look at that for piston PN. Will let you know.