I did a SBC 350 with a 700R4 swap in my 1984 CJ7 - so somewhat similar. I wanted the over drive gear in the 700R4. I used Novak's adaptor (Part # 137A) for the tranny to Dana300. I also got their twin stick kit (part # TX300), their twin stick knobs (part # KBLTBK716), and their dual shifter boot (part # TSB). I used their blank tunnel cover so I could cut my own holes for the shifters (part # F-7TTC) and their rear
trans mount (part # RMU). Just had to drill new mounting holes in the skid plate once I had the engine/
tranny/xfer case all in place and lined up where the mount needed to be. My
trans shifter is a Lokar (Part # CM700AM). I used the Omix-Ada 18606.03 boot for this Lokar shifter. That is a boot for a
transfer case, but worked perfect on the Lokar
tranny shifter.
The Lokar shifter also included the reverse switch to power the backup lights and also the neutral safety switch so it only starts in Park or Neutral. Just wired that to the light blue wire going to the starter solenoid. I've had this for about 4 years now and love it. Never any issue, solid shifting, never slipped out, works great.
Of course I had to change drive shaft lengths for the different tranny/adaptor/x-fer case combined length. And since I have a 4" suspension lift, I also used wedges on the rear leaf springs to angle the pinion up a bit to reduce the rear drive shaft angle.