Spend $700.00 to upgrade to power front disks using a kit. If you're using larger than stock wheels use larger than stock front rotors.

I upgraded without a kit and ended up using an adjustable proportioning valve to stop the rears from locking up. I used 1970 Grand Prix spindles, calipers, booster, master cylinder, and combination valve. Most of that was used as cores for rebuilt stuff at the auto parts store. Buy a kit it would be a lot less trouble.