On the supercharger / 2.5 question…as to whether it’s a bolt on, I'd say yes and no.
The SC's intake should bolt up no problem that’s the easy part.
Here is where it gets more difficult:
Keep in mind the old B&M SC kit was made for a 4 bolt crank pulley. Doesn't the 2.5 have a 5 bolt crank? (I’m not sure) You'll need to use the special pulley that came with the kit to spin the blower. Otherwise you'd have to get a custom one made.
Your TBI won't work with this SC, at least not without some serious engineering changes anyway.
On the electronics and fuel systems, I'd get a Mallory 2.2/2.5 mechanical distributor (3770901) to bypass the computer (they are pricey BTW). On the fuel side, I'd go with a Weber 38 carb which will bolt on the SC's carb adapter plate. The Weber 38 carb requires low pressure (about 3 psi) and if you use your electric pump you'd need a fuel pressure regulator for it. You also may need to rig up a different throttle cable setup when going to the carb.
Then there is the issue of engine compression, which may or may not be a problem. I’m not familiar with 2.5’s so I can’t say for sure.
Keep in mind too you'll also have to deal with hood clearance issues. That and you may have to deal with the B&M belt tensioner. The tensioner never worked right in an L body, but in your shadow it might. If not, we have some solutions here for that issue which we can get into later if you get it.
Anthony
1984 Dodge Rampage Supercharged.
http://www.cardomain.com/memberpage/557514
TurboDodge.com 
