I recently had my engine rebuilt by a friend. i dont think he did a great job on it cuz today it started tapping then grinding. i pulled it over and had it towed to my place where i found out later that the heads had been on the wrong side. he had installed the motor and drilled new holes for the brackets and such. would this cause the engine to just quit?

 

First off what year and cid motor? Also most Mopar heads interchange side to side and have the correct holes drilled and tapped.