You might also check with Harmon and see what their turnaround time is, I've used them a couple of times now (70 Challenger Bendix) and they've always gotten them done very quickly. Pricing runs a little more than Dewey but the work seems to be first rate also. They're in Georgia so shipping back and forth will be a little quicker. That Midland Ross is not one you're likely to find rebuilt in a box ready to buy anywhere.

https://harmonclassicbrakes.com/