90 amp? Wow, that's pretty stout.
I just found this online but it says it's for a 2007 (like yours Cory).
Displacement: 5.7L / 350 CID
Bore & Stroke: 4.00 x 3.48
Compression Ratio: 9.4:1 (High-flow Vortec heads)
Exhaust: ETX/CAT (Extreme Tuned Exhaust with Catalyst).
Fuel System: Multi-port electric fuel injection (MPFI)
ECM: Delphi MEFI-5 hardware/software system that is custom calibrated by Indmar.
Ignition: HVS High Voltage Switch Ignition System
Fuel Required: Unleaded, 89-octane minimum.
Oil Type: Pennzoil Marine (SAE 15W-40), service SJ/CG4
Oil Capacity: 5.5 quarts with filter
Oil Filter: Pennzoil PZ3
Spark Pugs: 41-993 (Platinum Tip)
Max. RPM: 5,200