That's an awesome pair of machines with an awesome story to them! I always appreciate those who love the narrow frames, as many prefer to stay clear from them because they're kinda difficult to work on with the non-removable tunnel cover. Once you get used to it though it really isn't that difficult. I love my narrow frames as well, and a 123 is on my "someday" list.
This place is amazing, all the repair manuals you could ever need are available here for free, and there's a huge knowledge base with many users who know how to solve almost any issue you may have. Never be afraid to ask questions!
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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)