[vidguy]

You're getting beyond my expertise, but.. You're going to have to make new lines anyhow. Your Drum lines are simply different then disc lines. And you really should use this opportunity to replace the hard lines at least in the front.
Alos be aware that you need the little brackets that bolt to the frame near the wheels that hold the rubber lines. These are different then Drum brackets. The fittings on the ends of the rubber lines are different on Disc and Drum cars too..
There has been MUCH discussion about what proportioning or delay valves to use or not use on a disc brake car. There is a discussion going on right now in suspension Tech.
I would rather not use a 30+ yr. old valve when you can buy a spanking new one for $50-$60 dollars.