Yes you can keep the ABS ...definitively...I also just did mine like TTocs. The Hurst kit & the extra pieces kit. I needed the lines they include...and a few fittings but you can buy the lines pretty cheap too. I'll post up how I had mine installed in a second...
Here you go...
Our cars don't need a multiport linelock solenoid. Just a single port cheapy like posted above from summit will work. I installed a Hurst unit about 6 or 7 years ago and only used 1 port and plugged the others.
Basically there are 2 lines that run from below the master cylinder up to the ABS box near the radiator overflow. One is for the rear brakes and the other is for the front brakes. All you need to do is insert the line lock solenoid into the line that goes to the port on the passenger side of the box, I believe its labeled MC.
I mounted my solenoid on the frame rail below where the stock air filter box is located. Disconnected the hardline going into the ABS box and added an extension and ran it to the "in" on the solenoid then made a line to go from the "out" of the solenoid to where I removed the other line from the ABS box.
Don't forget to bleed the brakes when done