Yes the cover is cast steel and could be hit with a Mig to build up this area and buffed flat, the bush in the gear is something I always change and the mounting peg comes free with a new oil pump, you will need to time up the complete gear train including the injector pump, the idler gear to the injection pump has no marks and is set off the pegged flywheel, the con rods are marked for front also, I always fit new bushings in the block for the Lanchester balance shafts also for the camshaft as they are always worn, the balance shafts are handed as the drive teeth angle is opposite cut, the rear crank seal is a hydro dynamic type with the steel sleeve that fits in 6 mm from the back case the sleeve on the crank has to be on around 4 mm past the end of the crank to match the pot depth of the flywheel, the front crank seal can be just a rubber job or again a hydro dynamic type with the steel sleeve that has to be set home in one like the rear.