Convert standard manual valve body to reverse

Convert standard manual valve body to reverse - what is needed?

cudajames said
After talking with John at CRT, I went with the race version - which he recommended based on my setup. I also ordered the thicker band strut, 4.2 lever and of course the servo kit. And from summit a new deep pan - with drain plug. Black Friday all about the transmission

Can I ask what your car specs are that John suggested the 22x?
I'm currently looking at the 2x and 22x but not sure what to pick.
Car is a Aussie version of a 69 dodge dart with a turbo 318 making around 600hp at the crank. It's a 98% street car that will see the strip only a couple of times.