If you want originality your going to want to look for a Kohler K161 7 HP, that was the engine they came factory with. If you don't mind as much about originality, you can also put a Kohler K181, 8HP, in it.
The air cleaner was originally an oil bath type.
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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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