2007 5.3 to 6.0 engine conversion

Here's the deal... My 2007 5.3L is gutless and I am sick of being in the mountains, wind and towing a boat at 3000 plus all the time !! I want to get the most torque and efficiency I can, either out of my motor or a 6.0L Swap. I also want to stroke the 6.0 to a 383 or more. I already have a Garrett hybrid T3/T4 Turbo, 600hp intercooler, oil pump and wastegate. So either I want either use this in conjuction with a stroked low compression engine or I wanna supercharge it. I'm just fed up with the gutless motor I have ! Does anyone out there have any ideas ?

Seriously consider a. Duramax powered truck swap. You have extreme demands for a light duty vehicle.

Sorry, I would delete this thread but I cant figure out how.