Boxford VMC 190

[m_c]

Personally, for simplicity I'd stick with the existing steppers, unless you really want to change them, as you won't get that much of a performance boost from changing them. And it avoids the hassle of trying to get pulleys that fit new steppers, as most new steppers come with metric sized shafts.
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I would however fit new drivers, but spec them so you can upgrade the motors later.
You'll most likely find lack of spindle power will limit what you can do, long before the stepper motors do.
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As for the existing motor specs, the X and Y will very likely be identical.
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Just make sure as you learn part numbers/sizes/details, write them down somewhere, so you can find them later. I personally create a word document for each machine I have, where I enter any information I think might come in useful later.