Well it's been almost a month since my last post and have been a busy boy since.
Besides upgrading the brakes, a new rear u-joint, exhaust manifold/pipe gasket, radiator bottom mount pads, and all suspension spring shackle bushings have now been replaced.

But by far the most challenging was upgrading the master cylinder to a dual type.

But in the end, it wasn't too difficult -- just took my time, kept my frustration (at parts sourcing) at bay and... voila! it was finished and road tested.

Here's the Photobucket link to the brakes upgrade.
If you have any questions about the job, please feel free to ask me about it.

http://s525.photobucket.com/user/my_pics48/slideshow/3100%20Truck/Brakes%20upgrade

As it turned out, Bartamos was right on with his front brake part numbers ..they were correct for this truck and fit perfectly thumbs_up
Thanks again to everyone in this thread, for your help shake

So, the only real challenge was doing some minor mods of the POL bracket (redrilled mounting holes) for proper frame fitment. And the bolts that came with the kit were of incorrect strength or thread for the application -- wasn't worth the hassle for reshipment as local hardware store had what I needed.

All and all, a fun little project. The new (front)brakes, lines and dual MC stop the truck ok, albeit not what a front disc kit would have provided, but satisfactory for my needs of casual driving.

FWIW, Rockauto were superb with their service. They took back wrong parts with no hassle -- even supplied return international postage, then a refund to my cc via Paypal.
And, I still managed to source some stuff out through FLAPS although it is getting harder to find what this truck needs: common parts are less-so nowadays ohwell