1964 GMC 230cid Inline 6 Transmission Swap

[Alb213]

Hello Fellas..

Im pretty new to this forum and need some guidence.

I currently own a 1964 GMC Fleetside with a 230 engine inline 6 w/3 on the tree.
I like to change it to a automatic. I'm planning on keeping the original 230 engine. Is is the possible to do the following... replace the transmission to TH350? What would be needed to make this work? adapter? I came across a TH350 from a 1985 Monte Carlo. I will be replacing my steering column to accommodate the automatic. Thanks.