Brakes, Suspension, Rear end , and Chassis stiffening...grrrr

"Muscle cars" didn't have 4 wheel disc brakes either, so why do you want them for a 'street bruiser?"

you really need to sit down, take some deep breaths, and decide what you want to do here. I'm not trying to bust your nut here for fun, I don't care to see you throw $$$ left and right without a plan.
 
the other thing is it would be kinda hard to have discs in the rear and still have drums up front. Maybe there is a master cylinder for that, but why would you want to? Do all of the breaks at once, with the proper master cylinder and lines.