The bolt pattern on the back of the A440/2 from an 80 series and an A440 from the 62 (as well as all split case patterns)is different. You would have to remove the tail housing off the A442 and bolt up an tail housing from the 62 inorder to use the split case. I plan on doing this as well. I already have the 62 A440 with attached split case
. Marlin is currently testing and tuning a system to use a toybox behind a A440, but there are oiling issues they are trying to work thru.
I doubt you could make the klune work, since the bolt patterns are different.