Duster Brake Combinbation/ Prop Valve

This has turned into a bigger job than I thought. My brother had an E body Combo valve (inline Tube) he had lying around for years but never used. It looked the same as my A body one except the bracket to hold it on. I modified the bracket and got it all put back together on my Duster. Well I thought I had it sorted until I filled with fluid and pressed the pedal. It pisses out fluid from the big plug on the bottom. Took that off and put a new rubber seal on it knitted it back up and it still leaks badly. I have stuffed around with this and cannot get it to stop leaking. Then today I noticed it is weeping out of one of the other front brake ports. Trying to tighten everything down around my headers which are extremely tight fit is a nightmare. Anyways I decided I am not going to Inline tube for another crack. I am going to buy the willwood adjustable 260-13190 which I see a few guys on here have upgraded to. Guys that have done this upgrade can you share your tips with me on how you did this. Did you run a small distribution block where the combo valve used to go on chassis then plumb down to that from the wilwood unit or make new brake lines that plumb right up to the willwood unit. Not sure which way to go.

wil-260-13190_fn_xl.jpg