Stan,

The easiest swap is 65 – 69 Lincoln spindles, rotors, calipers, master cylinder, etc. It’s the route I would go if I were converting your car.  The factory discs have big 4 piston Kelsey Hayes calipers and stops one of these cars with ease.  If you go that route get the 66 – 69 booster, master cylinder, and proportioning valve.  The 65 still used a single reservoir master cylinder.

GearHead Engineering offers a kit for $845 that includes everything.  abspowerbrake.com also offers a kit but the price is not listed on their website.  I have no experience with this kit but I’ve heard through the grapevine that it might not stop as well as using factory pieces since it uses a smaller floating caliper based off GM parts.

You might be able to swap something from a later model car, but I doubt anything as new a a Crown Victoria would work.  Perhaps an early 70s Lincoln or large Mercury setup would work.  I know I used 69 Country Squire discs on a 64 Galaxie I owned years ago.

Good luck!

@kerak

I’ve no personal experience with the CPP kit, but I’d suggest contacting CPP and seeing what they say about it.  You have to consider that these cars weigh between 5 and 6,000 pounds so they aren’t going to stop on a dime.   If it’s really not stopping well there’s obviously a problem somewhere that needs to be sorted out.

Are you sure both the front and rear brakes are functioning properly?  Did you install a new dual master cylinder, power booster, and proportioning valve with your kit?

Good luck!