1999 Bridgeport ez Trak conversion

I want to convert our 1998 Bridgeport EZTrak machine to LinuxCNC. i want to keep as much of the original hardware as possible.
keep servos and encoders both work with the 7i77
I plan on using mesa 7i77 and 5i25 or 6i25 and i want to use a dell OptiPlex 9020
I have the books and wiring diagram
I know i need to connect the motor drivers and ends stops to it
I dont know what else i need to connect to is
I whant to add a mpg (what is a good one)
the head is manual but i want be able to start it with the computer and make it so it can use the estop
I am very new to milling this machine is just not cutting it with how old it is (I got it for free)

Start here:
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to

how hard would it be to use the cnc part of the machine with out changing it using to old pc and how to do it

I don't really understand the question. Are you asking if you can re-use the existing control PC? What is it?

Yes I want to reuse the old pc until I use it some then switching like 6 months down the road how would I do that

When you say "the old pc" do you mean the Dell mentioned earlier, or whatever is in the existing control?

It is probable that the existing control can't run LinuxCNC. What do you know about it?