Poly to LA block swap questions

OK- I heard from Bob Asay that the pre 1962 (mine is a 1960) poly blocks have a different bell housing pattern.... so today I went to a friends house who is a MOPAR nut. He had a bell housing for a 318/340/360 and it indeed looks different then mine. Now my question is, would it be possible to either find a bell housing that fits my tranny (4 spd 1960 D600 truck tranny) that will fit the 318/340/360, or would it be possible to make an adapter for the bell housing, and a spacer for the flywheel ? I think I'd rather find the right bell housing, as it would be simpler to put together, but I do have access to a decent lathe, if I need it.

Any suggestions ???? Thanks.
Ryan