I think it depends on who/what you have access to, but new valves are available from Max and Kanter.
I imagine that the seats under those valves need dressing up at a minimum as well.
The biggest issue you have with valve and seat work is the clearance between the valves and the hydraulic tappet has to be within a certain range. If you grind the valves or the valve seat down too much, the clearance can become too small. Basically, if you grind the valves you want to grind the ends to maintain clearance, and if you grind the seats you need to check the clearance as well.
There is a gage, J-4540, to measure the tappet clearance. I was able to get one of them from Pacfic Northwest Packards, it's not listed on their project page but they still had them last year.
Pacific Northwest Packards Projects and Info Page Also you can get the tool from Max Merrit, look for J-4540R.
Max Merrit Gage J-4540R Hydraulic Tappet Clearance Gage Also there are instructions in new lifters from Kanter that show how to take a lifter apart and turn it into a gage.
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