changing bolt pattern

If you decide to ditch your Kelsey-Hayes front disk brakes, I'll pay $100 for the setup including spindles. Just set them aside and bring them next time you drive north or I can get next time I'm down that way.

If me, I would keep as is and simply get new alloy wheels. You can buy new big wheels (17"D I recall) in SBP. There were posts w/ photos here a few years ago. Cost $170 ea as I recall. You can also buy vintage SBP Kragers or slotted aluminum wheels. Don't fear. So many have changed to BBP that it is a buyer's market. I have an extra set myself.

Re getting rear 10" SBP drums, you can adapt front drums to work and they are cheap. You cut off the "snow lip". One guy does that and sells on ebay for a pretty penny. I found some good used rear drums recently.