Not sure if this is the right forum for this but I’m just wondering, what is the torque spec for the belt tensioner? Or are there any resources I could get that would have a general list of torque specs for a bunch of engine components and such?

Buy the Genuine GM service manual set for your vehicle. You may be able to get a used copy from eBay at a reasonable price.

Or direct from Helm, Inc.

Or a DVD-ROM copy from other sources. Not my first choice, but better than nothing.

FORGET about Chiltons, Motors, Clymers or any other aftermarket "service manual". They make excellent emergency toilet paper, though.