Re: Engine swap on 65 GMC 2500 305 V6
As you probably know the 351C is a medium/heavy truck engine and was not used in pickups. I believe the pipe thread hole in the block was for a hose nipple for the oil return line from the air brake compressor. Large trucks had different front motor mounts than pickups too, so there was no interference with the oil return line. If the pipe thread hole is on the same center as the 305 engine mount hole, maybe you could drill and tap a pipe plug for the engine mount bolt if it's large enough or weld a stud on a pipe plug and use a nut to hold the engine mount.
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