torque converter solution

i was all happy to install the tranny took out of the 82 diplomat because it had been freshly rebuilt, and with a hs /lock up sticker on the torque.
so i went to put it in my 67 belvedere and the torque hub is to big to fit in early forged crank.
so i will keep the original for now. the guy at the tranny shop said he has a overdrive
that is for a six . but im thinking that the torque wont fit ether.
i would think that they woud have to swap guts at a torque converter rebuilding shop
any ideas