Welcome to EBPF, DC97, glad to have ya here. Post up some pics of your rides, pronto

DD power "safe" limit = about 400 AWHP/AWTQ
Always perform maintenance on the Severe Service schedule rather than Normal Service schedule
Common issues with this platform = loose hoses, split hoses, oil pooling in intake/intercooler, PTUs and Turbos. Very oil quality sensitive.
Drivetrain is very similar to SHO/Flex. More like the SHO with the Performance Package.
Suspension = lowering springs right now. Coilovers not yet available. Sway bar not available. There has been talk of using the sway bars from the Police Interceptor, don't know who different they are.
Handling = Tires can make a big difference. If you put on offroad tires, don't expect the best handling offroad. If going on the beach, lower tire pressures. That kind of thing.