Do not know much about BB chevys. I found a 65 or so Bus with a BB. I figure its a 366 or whatever that oddball BB is. It does have a 4 bolt block with a steel crank. it is missing 1 head, intake and oil pan. Looks like the bore is smaller than a 350. My question is, is this crank good for anything else? can it be used in any other BB such as the 396 - 454, are they different strokes than the other BB?