Ok will look for info on the motors later but from seeing the pic  I am sure you will be able to replace the drives with ones such as Geckos which may reduce the retrofit cost, suppose it depends on what kind of budget you have for this retrofit.
Hood

Cant find any info on your specific motor but they should run fine from Gecko drive (G320), you will also need encoders to replace the tach and resolvers and a breakout board. I presume the power supply that is currently used would be fine so apart from a computer that is probably all you would need.
Hood