here's what i've found to be the easiest: Early Classic Enterprises has a spindle that works with the stock 64-66 suspension. I've grabbed calipers, booster, master and small parts from a 80 G-20 van. Yard parts=$50. Dropped spindles and 6 lug 1 1/4 rotors+dust caps, bearings, etc small pieces=500. So for $550 I will upgrade everything. If I went to 5 lug I could subtract about 130 from that total of new parts.
Freaking gorgeous pieces from ECE. can't wait to get my spindles. The extra benefit is that they are 12" rotors, not the 10" found in some of the kits. Massive freaking rotors.
I'll post pics of the upgrade when I have all the parts.