Brakes won't hold pressure

You didn't swap out the drum/drum for a disc/drum? Did you bench bleed the matter cylinder? Are your bleeder screws facing up?

No I didn't, I was kinda hoping I could skip that by adding in the adjustable prop. valve to the rear main body brake line. Jury is still out if that was a good call or not.

Yes I bench bled the MC before installing it.

If by facing up you mean the bleeders are above the brake hoses/lines then yes I do.