I don't own a GM anymore. I am confident I would still win.
You will be on your 20th water pump and 5th timing chain

For an LS3? The timing chain is about a foot long, and only connects the cam to the crank...as it should be.

The water pump is still a weak spot on these motors, but usually fails closer to 200k miles than the 60k my Kappa's did.
FWIW, my I feel that if you can live with the initial cost/high gas mileage, the GM V8's are fantastic engines. The amount of aftermarket support is incredible, I can pick and choose vendors. Honestly, for some things AC Delco is a great choice...others, I've got MSD, Hollet, Edelbrock, and many other to choose from. The aftermarket support for my truck, to speak nothing of the Camaro, puts the Kappa to shame.
But I buy used, I'm not paying money for a warranty/stealership hassles but have to deal with any problems that crop up. The truck has only had minor issues since I ditched my Kappa for it almost six years ago. The only issues have been a dead stereo, u-joint, dead battery, (normal for a truck that age) and the fan blower resistor. Hopefully the Camaro follows suit. With the main GM V8/transmission combos you can be pretty much sure your power train won't have any issues. Other bells and whistles? Not so much so, but so long as I can still drive I'm fine with that.
The other advantage of buying used is you can kinda tell if a vehicle is having weird issues or not in it's service history.
(FWIW, I buy most of my AC Delco parts from Amazon, since my local stealership seems intent on charging triple what Amazon does. The local Dodge dealership? Oh they price match Amazon...)