Great plan on going back to original on the fuel set up. I'm fairly certain that the A1s kept the vacuum wipers throughout the service run, so the original style of double acting fuel pump/vacuum pump will look and function properly.
The brake going to the floor is a common issue, with a not so popular solution. Invest the funds and buy all brake parts new. From the master cylinder, lines, soft lines, and wheel cylinders. The second bit of advice is to purchase American made pieces. This will save you time and headaches by preventing fitment issues. I have heard that Crown has improved its quality of brake components, but I would still stick with domestic made Wagoner products.