1985 4020 vs. 1997 VMC 15

I own a '97 VMC 15. I have a line on a cheap 1985 4020. The 4020 probably runs, but hasn't been under power by it's present owner. If the 4020 is only a parts machine, are any of the electronic components, CARDS, BOARDS, AMPS, transformers, etc. worthwhile to own? CRT, spindle drive, motor, spindle? Axis motors?

Thanks in advance,

Tim