HELP ME!!! Brake issues

[**grumpy**]

My 66 has 72 disc-brake front, and 72 12-bolt rear.
When I bought it, the PO had put a 85 F*** ranger booster/mc on it. The brakes were shakey at best.

So I put new rear wc's, hardware kit, all new brakelines and rear rubber hose, from rear to mc.
Then my calipers were crusty, so I replaced those too.

Well, he had everything through a junky proportioning valve, and both rear fittings broke off it the pv. So after talking to a local old guy who's built tons of old hotrods n customs, I just by-passed the rear and ran direct to mc.

But front still running through pv..

Ive bled the system over n over. I got a vacuum bleeder and did it a couple times around.

Still no peddle..

So what am I missing? Is the fact the front is through the pv why this is happening?
Ive spent 3 days on this and Im mentally and physically exhausted by it.

I built the Bare-steel 53 Suburban a few yrs ago, and it had a MII disc brake front and I remember not running a pv and it was fine.

So if any of this rambling made sense...Please help!

Thanks