the plunger rod sticking out of the t-bird booster is too short to use with the crown vic master cylinder which if you didn't change your brake pedal would be almost to the floor before it starts applying the brakes but it's an easy fix. When you pull off the crown vic master cylinder off a parts car notice how far the plunger rod sticks out past the front of the booster, you need to copy this length sticking out on the t-bird booster. Unscrew the plunger rod out of the t-bird booster and go to Lowes or Home Depot and match up the thread size and count and buy a 1.75" hex head bolt, ground the head off round like the end of the t-bird plunger rod, screw it in to the t-bird booster leaving it sticking out the same distance as the one on the crown vic booster and now you'll have a good high pedal when applying the brakes. Pick up the proportioner valve off of the crown vic when you get the master cylinder and screw it into the rear port on the cv master cylinder and pick up the junction block on the crown vic also.. hook up to a vacuum line on the intake side of the supercharger, you might have to add a t fitting to the big line running to that side, I did. Here's some pics of my delete.