I finally got my emergency brake cables hooked up & working good on my 58 Belvedere. I bought a cables set for a mid 60's C body car from
http://www.inlinetube.com (check'em out). The rear cables worked good, but I had to modify the front one slightly. I had to take the part that mounts on the hand lever under the dash off my old original cable by drilling a hole on the side top & then "slicing" it down the same side from the drilled hole to the cable ball with an air wheel cutter.
I slipped off the old cable & slipped on the new. I also had to make 2 brackets to mount the cables under the car on the frame in the front & rear. Everything is working good now! Thanks for the input everyone!