My take on it is that it'll probably be almost impossible to get the head perfectly level just in a vice like that. And once you're actually doing it, it's always possible that the head moves a bit if you move too fast, you don't realize that it moved and keep going, and then your head has a slope to it.
I personally would stick to the sandpaper on a flat surface method. As long as you do it right there's pretty much no chance of having something go wrong.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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