Probably gonna go the Dr Diff route. If I decide to keep my rear as drums and switch out my fronts to discs, would it be best to change out my stock master cylinder/add booster or can I continue to run the stock cylinder?
I would swap out the drum/drum master cylinder. Personally I like the 15/16” master cylinder DoctorDiff sells. I use that size because it works well without a booster, but even though it’s straight manual brakes the pedal effort isn’t bad with that size master cylinder. But that’s just my personal preference, I like manual over boosted on these cars.
DoctorDiff can help you with some of this stuff too, if you call and order you can discuss your options and needs for your particular project.