Your engine is an EN 377. Serial number 4365. Bore and stroke 4"x5", 377 cubic inches. Almost all Mack gas engines of that era called for a point gap of .022", you're real close. Are you looking for any specific information? With any old truck that has been sitting for some time, you have to suspect some crap in the fuel system will cause you trouble. But in the other hand, it could be any number of things making it run rough. Good luck.
