Trouble starting when engine is warm

I recently replaced the engine in my truck listed above. I swapped everything over from the old engine to the new engine that I could without having to replace it. The engine started up immediately and was timed appropriately based on the 0° before top dead center label on the radiator shroud. The temperature gage never registers more than 160°. Are used a thermometer which says that the temperature is well over 180°. I have trouble starting the engine after it is warm. It also has a small stutter in acceleration when applying the accelerator pedal abruptly. Is this a timing issue or an overheating issue?