welcome....first thing since you have a lot of salt issues as seen on the crome on the bumper...check out the Power Block show TRUCKS...they had a handy device that connects to your frame and runs a current that slow the corrosion, process from salt...that will at least slow down the damage from it....if you cant find a bigger motor on island..I.E. 5.3/6.0 then go tune/converter/headers...
06 silverado CC Volant CAI/ Corsa Sport exhaust
dynatech supermaxx headers/cats
LPE GT2-3 cam/ Comp 918's/ Rods
Eaton LSD 3.73's
IAT Shocks
DANNY TRANNY w/2800 TCS billet verter
275HP and 293TQ Pre Cam
314HP and 303TQ post cam