Rear disc swap and prop valve question

[1981silverz28]

I have an 81 Z28 that I put a factory disc brake rear from a 79 Trans Am in . I have the Camaro disc/drum proportioning valve still on the car but was told to put an adjustable one on the rear brake line. I put a Wilwood on the rear line right as it comes out of the master cylinder . The brakes aren't any better than the drum setup that I removed . Did I do it wrong ? Any suggestions would be welcome.

[ProdigyCustoms]

The factory drums had more clamping power then the factory disc in those cars. You do need a adjustable prop valve for trans am WS6 prop valve, but at the end of the day, those brakes only look better.

[1981silverz28]

Thanks Frank, what would be a good setup to use on that front and rear without having to modify a bunch of stuff ? I'm not looking to win a 0-60-0 competition but just want to stop better than stock .