I went around in circles for a while trying to figure out how I wanted to do it.
Based upon what you are looking for, I would recommend you upgrade the front rotor/hub to the Corvair, similar to Bubajoexxx. This will give you a larger bearing surface and the option for a larger bolt pattern. It's not a bolt on solution, though.
For the rear, use the intermediate upright and bearing from the A-body (or G-body?) as I mentioned above, or use that upright with the s10 bearing. Again, this gives you bigger bearings and bolt pattern options.
You can use one of the brake options offered in the mall, 12" or 13" or LeBaron.
Personally, I went the harder route. I'm using the Celebrity wagon uprights, hub and 10" brakes in back. For the front, I swapped in an 88 suspension and made my own 13" brakes using Cobra rotors and 02 Camaro calipers.
FWIW, boxing the a-arms is welding in plate to the bottom to create a "box". This strengthens the part by preventing flex. No idea how much the stock parts actually flex.
[This message has been edited by RCR (edited 07-21-2013).]