I am sorry to hear of your fathers passing... My father started me into cub cadets in the early 70's with a 100. He taught me that they were fun to play and work..and also a very useful tool to work with.
I agree with the others.... leave the 123 a hydro... maybe fix the engine, Build the 128 into your puller and have fun with it.. 
But they are your machines, so do what makes you happy!!  
__________________
Jay
40 years of Using and playing with IH Cub Cadets!
Proud owner of the following:
Cub Farmall, Super A Farmall, Original, (2)70's, 72, 100, 102, 123, 105, 125, 127, 108, 128, 1450, (3)782's, Yellow 982, 1782, "Sam's" 2182, M Farmall and a #7 trailer
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