Parts for converting orac to mach 3

Hi all. I am looking to convert a Denford Orac to mach 3. If possible I would like to keep the origanal stepper motors to keep the costs down. What driver boards, power supplies etc would be needed and where to buy them? As you may have gused I know nothing about converting this lathe, but very willing to learn.
Any help is much aprechiated.
Mark