Jerry,
Those valves with 2 grooves sound like chevy valves. I don't think MM ever used valves with 2 grooves originally because the inner groove is for an o-ring seal. Let us know if they say "MM Made in USA" or some such on the heads. If you need keepers, get a set for a small block v-8 chevy and they will work. They only use the top groove any way.The extra length in the stem should only be an issue if backing the adjuster off all the way does not allow the valve to seat. It may take a 'dry fit' with the block, valve/sprng/keeper, rocker arm and pivot on the crankcase with the cam installed to tell. Well, the adjuster screw could hit the valve cover too, But I've seen engines where the valve cover was 'relieved' with a ball peen hammer for a little extra clearance. If the stem length looks like a problem, get your valve guy to grind some off it. It is more important that the valve spring has about the same installed height it had originally. Because you want the springs to put enough pressure on the valves to be sure they close promptly and seat properly when they are supposed to. This will have more to do with the distance from the valve face to the keeper groove in the valve stem and how much the seats have been ground. If you are concerned about the springs, Wendell Everett has them. 740-922-3335. Charlie Biler has them too, but I don't know his number. If its just a show tractor, I wouldn't worry too much about the springs unless one or two is noticeably shorter than the others when they are sitting on the workbench. (This assumes that your springs are all original without other noticeable differences between them.)
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