Problem with disc brakes after swap

I have factory disk brakes on my 68 dart, switched to manual with an aluminum MC and 2 to 4 bolt adapter. MC was off an Aspen/volare 79 model, 1 1/32 bore, rockauto has them on close out for $20, pedal is a little more firm but works just as good as it did with the brake booster installed. Are you sure the donor had the correct pushrod? Do the brakes drag at all?