Problem with Wilwood Manual Brakes

[SouthernRodder]

Guys, I'm looking for some advice please. My application is 65 C10 with square body front stock disc setup, all new rear factory drum components, also every line on it is new. I had an older CPP style booster and MC. The MC started leaking and I wanted to neaten up my firewall so I decided to convert to a Wilwood manual MC and prop valve.

I have a 15/16" bore MC and Wilwood prop valve, a 10 psi residual pressure valve for the rear. I made sure the push rod was in the correct location for a manual brake setup.

Before i converted I had really good brakes. What I have now is not that.... My pedal pulsates when i press it. Pedal feels good and firm, but the brakes will not lock up, even on loose gravel. I feel they have been adequately bled but just can't comprehend what I'm feeling compared to what I had. I called Wilwood and they explained that those are super large factory piston calipers that require a lot of fluid and they questioned my choice of 15/16" bore, but I have several friends who have run the same setup with no issues. Then they questioned that my calipers may be bad, but again brakes worked just fine prior to converting.

Also I have adjusted the prop valve from top to bottom and no change at all.

Any ideas what may be going on here?