Barely any Brakes

I agree with the OP that the comments "need disk brakes" are getting repetitive and unhelpful. Does anyone really think that well functioning drum brakes cannot skid the tires easily or keep the car from rolling in reverse?

You said the shoes and drums looked good. Do they look brand new? It could be they are and just need some use to seat the shoes to the drums. Verify that for each set, the aft shoe has a longer lining than the fwd shoe (OK if they are the same, but should match left & right sides). Since you bled the brakes, it sounds like fluid is flowing thru all the tubes and hoses. If the pedal is not sinking as you hold it, and it well away from bottoming out (piston in MC bore), I think the MC is good. It is possible for the rubber hoses to degrade inside and clog the flow as you press the pedal hard. Rare, but some have experienced that. The "distribution block" in your car should be just that, with an imbalance warning switch. Make sure it is correct and that nobody swapped in a "combination valve" for disk-drum cars (has internal proportioning and metering valves). Worst-case, start disconnecting tubes and blowing thru with air to verify. You did "bench-bleed" the MC first I assume. If not, it is full of air bubbles and won't work right. Search youtube for many videos.