A valve job in the original form is a big deal. You grind the valve and the seats,, then you grind the stem of the valve to get the right clearance. You can install adjustable valve lifters (I think they originally come from one of the old 8N Ford tractors but don't quote me on that). That will make it a lot easier to do the adjustment, but it requires removal of the cam I think, which is not something you are going to do in-frame.
Can't say I have ever had a problem with bent valve stems on a Ford.
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