Sounds like a good buy to me! The 1641 is a "cyclops" series Cub Cadet, there are many users here who like them. Any questions you may have will certainly be answered here!
By the way, got any pics of this beast?
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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)