I just changed directions with my rear end on my 40 and am going to be using rear disc brakes. I have a corvette type MC and am going to use hydra boost instead of a vacuum booster. I understand I need a 2psi residual valve in the front line, and a metering valve in the front line. The rear line needs an adjustable proportioning valve. I'm assuming the rear needs a 2psi residual valve as well? My front calipers are GM metrics I'm pretty sure and the rear are going to be from an Explorer. Does this sound correct, or what would you do differently? Thanks in advance for the help. I'd like to build the system once and not have to go back and do it again.