Once the engine and transmission is out of the way, everything even remotely resembling a motor mount needs to be cut out, and some better designed ones need to be fabricated and installed. Someone has done a horrendously bad job of adapting that engine to the bell housing and the frame! A standard shift bell housing for a 1964-1970 or so pickup (V8 or 6 cylinder) will have the correct bolt pattern to mate to the engine, and it will accept the SM-420 bolt pattern. Then you can go about adapting the proper bellhousing to the frame without all the blacksmithing that's been done so far. If you install a tubular cross member in line with the front motor mounts, there will be a 4 point support for the engine and bellhousing, and no rear mount for the transmission will be needed. Open and closed driveline SM-420's are virtually the same- - - -only the rear bearing retainer with the torque tube pivot area and the universal joint is different.
Jerry
