Here is what I did. This is on a 95 YJ with external slave I think the internal master cylinder is similar.
I used an 1/8" punch to drive out the roll pin that holds the line into the master cylinder. I then cut off the plastic hose and hack sawed off the hose barb off the fitting.
I then drilled and tapped the fitting for 1/8" pipe thread.
Then I threaded in a 1/8" pipe thread to 3/16" flare adapter from my local hardware store. Check to make sure that the fitting does not screw in so far as to block the passage. If it does cut it a little shorter.
I then reinstalled the fitting on the master cylinder and ran 3/16 brake hard line down to next to the slave cylinder on the body. Then I used a rear center brake hose from a 83 Caddy Eldorado (3/16" flare both ends about 8" long) to form a flex line to the a short piece of hard line into the slave cylinder. In my case it was a Jeep CJ slave but I think the chevys have the same threads.
In my case the YJ master did not move enough fluid for the CJ slave and I had to change out for a CJ master, but other wise it worked great. In your case I think the YJ master will move enough fluid as the chevys used a smaller slave then the CJ's.