All the following are on the VR4 model. Outside of the fascia changes, I don’t know what mechanics were altered (if any) in the other models.
The biggest change between the first and second generation was a move to a six speed transmission. The engine did go to a four bolt main after 91. You can read up on it here
http://www.allpar.com/mopar/3.html
The jump from 300 to 320 was because they raised teh stock boost from 10psi to 12psi. Put in a good boost gauge (a must since the stock ones are never accurate) and a boost controller and you can safely go to 14-15 psi with no changes to the fuel system. This will get you Closer to 340hp by itself.
AWS did go away but I am not sure exactly what year that was. 97 sounds right though. It was there at least through 95.
94 and 95 had 5 spoke chromies that I have on mine and 18s as options. Prior to 94 they were a different design and all 17s.