bolt in rear coilovers: qa1 or spohn

[70chevellemalibu]

im thinking of installing them in my 70 chevelle, has anyone installed these bolt in rear coilovers? any thing you didnt like about them? how much ride height adjustment did you get out of them? and where you able to run rear disc brakes with them?

the main reason for wanting these is to improve handling while having the ride height adjust ability in the rear for the squat look.

Thanks