? about hydroboost brakes

[TurnNBurn]

I am just about finished installing a hydro boost setup out of a 79 diesel, I am putting in a 78 that had vaccum brakes. I have a concern that I hope someone can help me with. My stock vaccum booster has the big brake line fitting on the front , and small brake line fitting on the back of the master cylinder. The Hydroboost is backwards small on front and big on rear. Which fitting on the master cyl of the hydroboost goes to the front brakes?? , and do I need the brake valve from the hydro or can I use any power brake valve?