72 K20 4speed to 700R4 swap questions

[72 K20]

I am thinking about swapping my truck (K20) from the 4 speed trans to a 700R4 overdrive. From what I understand, the 4 speed 205 transfer case has a different input shaft than the automatic TH350 version.

I have an 84 K20 that has, I believe,the 208 TC . I have an adaptor for the 208-700R4,, and I have a 4x4 700R4.

Has anyone done this swap ?

Would I be better off finding an automatic 205 TC ?

I believe I still need an adaptor to go from the 700 to the 205 correct ?

I'm looking for ideas and input !! All reasonable suggestions are welcome !!

My ultimate goal is to have an automatic and soften the 4:10's with an overdrive !!

Have a great day everyone !! Tom