trans conversion problem

[Vero67]

Converting my 67 K10 from a three on the tree to a SM465 keeping my T221. I rebuilt the SM465 and have it installed. I have the correct adaptor, but when I tried to mount the T221 there was about a 1/4" gap. Pulled it back apart, the output shaft from the SM465 and the input shaft on the T221touch leaving the gap. Was there a length difference in the output shafts on a SM465. Mine was supposed to be from a 72. If I can't resolve this I will have to find a three speed to gut, or convert to the 205.
Not looking to spend a lot more $$