Bleeding Brakes - 9" Drums

You are not using the original 65 Dart split block are you? If you are somehow, I don't know how because there is only 1 port in the top of it for a single master cylinder line. You need a split block from a 67 and up with 4 wheel manual brake's, could be from an A or B body car with 4 wheel drum's, as you need 2 incoming port's to screw each master cylinder line into. Then there should be 3 out going ports, the rear main line going to the rearend, and 1 to left front brake, and the other 1 for right front brake. I'm sure we have a split block here at the shop, if you need one.