Bridgeport Interact II Retrofit

Hello LinuxCNCr's,

I have two Bridgeport Interact II mills.  We have been running linuxcnc on the newer (1994) machine for almost two years.  I am in the process of retrofitting the second (older) of the two. The spindle motor was working fine when the TNC controller finally quit on this machine.  The CONTROL TECHNIQUES 6P4Q-7.5 spindle drive on this had issues when it got hot so I want to replace it.   

My question for this forum is this:   Can you help me decide whether I should purchase a (used) DC speed controller and keep the existing spindle motor (specs below) or should I rip it all out and put a 3ph motor and a VFD in it?   I am perfectly comfortable with the 3ph/AC motors and controls, DC motor controls, not so much. 

Parker 514C-32-00-00-00 controllers are available for $700-$900 on ebay.  Can anyone help me determine if this Parker controller will work with my spindle motor? 

Is there a better fit?  

Thanks in advance!

Here are the specs for the 514C https://www.dropbox.com/scl/fi/hj4h7877623h1s3tfxqhz/2024-04-27-18-08-55.png?rlkey=nlu0re6uxcjp6e2iqigox4y6e&dl=0 (screen grab from 514C manual) https://www.dropbox.com/scl/fi/hj4h7877623h1s3tfxqhz/2024-04-27-18-08-55.png?rlkey=nlu0re6uxcjp6e2iqigox4y6e&dl=0

The manual for my 6P4Q-7.5 drive describes my spindle motor as follows:

Motor type 2M112L
RATING IN CONJUNCTION WITH 6P4Q-7.5 DRIVE MODULE
  0KW at  Orpm
  8KW at. 1000RPM
  6KW at  4000RPM
  4KW at  6000RPM

ARMATURE
  Voltage - 400V
  Current - 0/27/18.5/14A

FIELD
  Voltage - 150V
  Current - 3.8/0.78/0.48A

MOUNTING
 Special flange
EXTRAS
Two microthermal sensors embedded in the windings

VENTILATION 
Separate three-phase motor-driven fan unit with air filter mounting on main motor frame
Voltage - 380/415V
Current - 0.7A

TACHOGENERATOR
Direct coupled to main motor armature spindle. 20V/1000 rpm