As it says. I know i need a proportioning valve, but other than that, is there anything else i need?

You changing whole rears or just the brakes?

Ed

I'll be doing this in a few days (changing the whole rear, posi drum 10 bolt for posi disc 9 bolt--temporarily), and am curious to see if I've got everything. I should because I've got the parts car sitting in my driveway....

I'd invest in new axle hard lines unless you just have to cut and flare your own. You'll also need a set of the correct e-brake cables.

Ed

I bought a whole new 89 1LE Camaro 9 Bolt with disc brakes, i already have the brake lines and e brake cables

I used flared lines and was suppose to use bubble on the rear no leaking but could that cause a problem. I will change over once i get around to switching to the pbr's.