Either turbo or centri should allow you to keep your rear exiting exhaust.
I went TT over centri for a few reasons:
-don't see as many turbo V8s compared to supercharged
-I much prefer the sound of turbo vs centri
-easier boost control
-simple install, no crank pinning
I was looking at the ESS superchargers prior to going with the AGP TT kit, if I went centri I'd probably go with ESS.
If you are interested in a used AGP kit + fuel system send me a PM