So I realized on the Formula S I'm finishing that I may have the wrong timing cover on it. It's a 340 car with the original engine and I assumed the original cover when we got it. The clue I might have an issue is when I went to set the timing for start up and I realized the balancer didn't match the timing mark. I believe I may have a 67 cover and or balancer on the car, the car did run when we got it with no abnormal vibration. I guess the balancer hub could have slipped but if the mark was on the driver's side it would not be visible due to the power steering pump. Currently the mark is landing under the alternator in full view but no tab to measure it against. The easy fix is to just use a 67 timing tab but I'd like it to be correct and more importantly I want to know the difference for future reference. It is a 10/15/67 SPD and I don't know the original engine assembly date.

Thanks in advance, Kevin