Well hopefully they will, but while they're out, now is the time for a little wiggling to see how floppy the valves are in the guides ( any more than about 10 thou head shake is worn) but more relevantly now is the time to examine the valve and seat surfaces.

If in any doubt it is time to try a little lapping with fine paste.

Then look at the surface of the valve, if it shows just one patch of grinding, the valve is bent.

If the valve is straight, continue with careful lapping to get a good contact surface, using the finest compound. Don't be tempted to use coarse to speed it up.
You should end up with something like a continuous smooth contact surface between valve/seat at least about 1/16+" wide.