Valve truble

I haven’t seen any pics of a straight edge across the valves, or been told how much different they actually are.

If the valve lengths are stock, and the tips vary a bunch...... it’s certainly possible that some seat replacement might need to happen to make it truly “correct”.
Is that in the budget?

Might be able to get close with some tip grinding....... of course, how much can you take off before you’ve gone through the hardened part?