As far as the remote start, eventually the LAN will have to convert to real wires. I spliced everything in to the igntion switch harness (which I think was the same from 1990-1996. The alarm could be a little more fun, but you should still be able to find the correct inputs (door trigger, trunk solenoid, etc.) might even be able to get it to work with your factory remote.
The good (or bad news) according to how you look at it - is that Viper alarms must be installed by a factory authorized shop - unless you know someone
Heath