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

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.

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Very nice car, love the green. You have a lot more power than I am running. Mine is a 408 stocker around 470hp at the crank. You should call John and chat with him to get the proper parts