Although a disc conversion is really planned on the front, converting the rears seemed like overkill at the moment especially as we are trying to keep this a lower budget project. The rear drums on the car are the wider big car drums and with a complete rebuild should work fine. For less than $60 new wheel cylinders, shoes and hardware can get the rear brakes in good working order. We did go ahead and replace the rear axle bearings and seals while we had it pulled down that far to make sure the rear end side is good for a long time.
Getting the rear brake lines to loosen off the old wheel cylinders was a fail but new lines are needed anyhow so we just killed them. We will be running new brake lines around the rear housing and replacing ALL the lines including the rubber rear end to chassis hose with new line.