New Machine Build CHNC 2 to Mach 3 Conversion questions!

Hello All!

I recently purchased (2) CHNC-II cnc lathes with turrets, has anyone converted on of these machine before?

I am really perplexed about the air cylinder that changes the turret position. I am thinking of replacing that with a stepper or servo, what do you guys think?

Also anyone know where I can get the manual/parts list. And if anyone needs some parts of them (like electronics) let me know! Both are fanuc controllers.

Thanks

Mike