I will check TDC on Friday when I return to where my cars. Thank you both for suggesting it!
I don't want you to assume I think you don't know, but have seen some odd techniques, so offering one good, one sort of emergency room trauma that might send you back to the good one
1 - Best way is to use a piston stop, thread it in the plug hole, turn the engine with a wrench until it hits, mark the balancer at the timing mark. Turn it the opposite direction until it hits again, mark the balancer. Absolute true TDC will be exactly the middle when measured between those two points
2 - Battlefield check - plug out, bump the starter until you get very light pressure on your finger. Slowly by hand, with a dowel or some other tool, have a buddy turn the motor by hand, same direction (clockwise from the front) and watch/feel the dowel raise. When you feel it ever so slightly drop, go back to highest point NOT exact, but it would show if your balancer ring slipped by a large amount or you had the wrong balancer/pointer combo
If that were the case, then you can get a piston stop. If the balancer slipped you can get a new one, if the timing pointer doesn't match, you can remark your timing marks
The good thing is when you do this and check the firing order, 2 troubleshooting steps are done and behind you. Best way to eat that elephant