67 dart front disc upgrade made..still not right

Grump...all of the above are new.
Did some troubleshooting this afternoon...booster is good....push rod returning all the way.....shimmed out the booster further from the firewall to ensure rod length is sufficient, resulted in more pedal length but same pedal result.
67dart273...thanks so much for the links...those are great....i misspoke earlier when I said metering block, meant distribution block.
Thought about the block switch moving...tapped and brake pedal bled both front calipers at the same time...(2 man job)..no change.
Concluded MC bore is too large unless you guys have anything else you might consider or confirm :coffee2: