Here are photos of the bell housing I have, Casting number is 3738373.
It has the 2 mounts on the bottom of the bell housing for the cross member mounts. Also, the transmission mounts are correct for the SM420, top 2 holes are threaded, bottom 2 holes are pass through holes and the bolts thread into the transmission. Block bolt pattern matches the SBC V8's and later straight sixes (230/250), and possibly 292? This bell housing uses the mechanical clutch linkage from the driver side.
