I put a GTA box on my 12V motor. Gear linkage took a bit of work (mostly by CJ with minor tweaks by me). After some tinkering, the reverse lockout worked a treat - gearchanges were lovely. My motivation for the swap was changing an old (but OK) 5 speed for a relatively new GTA box with Q2 as at the time, I had intended keeping the car. If you happened across a NOS 24V 164 box it would be an excellent option for your situtation I'd think.