No idea on how easy the ABS swap is, but supposedly installing ABS is really simple. If I remember correctly someone said it takes around 45 minutes to INSTALL. that isnt counting pulling it out of the donor car.
If you have a complete donor car then you can swap it all. But it will be a lot of work. Mainly the ABS. Wiring, brake lines, speed sensors, rear wheel bearings, front axles....
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