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I agree with Jim/TX I will just add a few thoughts. If you decide to use what you have ,you will have to remove the head, valve guides and the valves. I have ground valve stems on my bench grinder but you've gotta be real careful. The valves are too hard to cut with a file. I would remove and do one valve at a time so as to not mix them up. Too small of valve clearance will cause burned valves and a low speed miss at the very least. I set my original type valves used with an original stock cam at .016 intake and exhaust and have NO problems.
The valve lifters can be replaced with the engine in the car but it won't be easy. You won't need to remove the head. You will need to remove the radiator, timing cover, valve cover, valve springs, oil pan and the cam shaft. After removing the valve springs, you can use clothes pins to hold up the old lifters for clearance to remove the cam. If you go this route I would recommend the single lock lifters, for two reasons. Obviously the single lock lifters are easier to adjust but they have a larger base. The larger base is easier on the camshaft lobes and iI believe will effect duration and performance.