I don't believe a 6 banger bellhousing will mate to a v8. I believe the tranny is a saginaw, I took it out of a '66 6 banger chevelle I found in a junkyard. They are stout tranny's. I had it behind a slightly warm 400 small block and never had a bit of problem with it. The 400 had an Isky 30/30 cam, Offy 360 manifold, 650 double pumper, and headers. Everything else was bone stock and the tanny never gave me a trouble. The rear end was a different story. I wish you luck with your swap.