If the transmission is used with an enclosed driveshaft, there is no seal front or back. Not sure why the tranny would be leaking excessively, unless it is overfull.
The engine appears to be a splash version of the 235 engine. It has the little plate on the lower block on the driver's side. 1953 engine, it should be good for 105 hp and around 200 lb/ft of torque. I believe the line passes through the block under where that little cover is at.
John
