what glow plugs are compatible whit this motor the plug says N3 on it but i was wondering if a Mc Coy MC-59 would work just the same

I believe this motor is the same one that is sold as the K&B 18. That said any hot glow plug should be fine in it. Most newer plugs are not truly long or short but a compromise so any will fitany of the newer designed motors.
Dennis

also what temp should this motor run at