Re: 351 Identification M or no?
You might get an extra ring on the piston with a big truck 351C engine. So there could be some benefit beyond more power. This doesn't look like a straight swap because the pump bolted on at the front of the engine might not fit under the hood of a pickup. There might also be problems fitting this engine behind the radiator with the extra pulley. These are probably not hard to deal with unless your camper special needs power steering and something on the 351 setup is in the way of what is on your 305.
Good luck with your decision and, if you go ahead, making the switch.
JRMunn
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