Should be a 292. "F" Flint Michigan plant D180 April 18, 1970 ? Someone will come along and confirm this? Are you sure on head number? Is the "3" 843 an "8"? If it's "848" that is a 235 head. If the valve cover is off what date code is the head? Letter followed by numbers like D180 Is your fuel pump mid engine and not towards the front? I believethat is how the 292's are.. If the engine is a 292 I don't think a 235 head will run on it? Experts will be by to confirm. Does the engine run??