Subs In a '79 Camaro

Hello Everybody on the Interwebz,
I've got a 1979 Chevy Camaro and I'm trying to sort out a set up for sound in it. I don't know much about Car Audio since I deal primarily in theater and live sound. What I want is to upgrade the Radio, Replace the speakers and Stick as big a pair of subs as I. The subs will be mounted Directly behind the rear bench seat and need to be able to scare the **** out off people when they hear them, and then see them when i put the back of the seat down. But i want to retain some of my mids and high's so i can hear something other than just pure glorious bass :D. All advice and imput is welcome and helpful.
Thanks Everybody!!!

do a pair of 6.5'' comps in front door.
Leave the rear 6x9's out and put 2 10's in the trunk. The biggest problem is your car is going to have 1 million rattles.

And what do you recommend for an amp? And placement?