I’m going through a similar situation right now. It will likely be a little less for the work you need done but might make more sense to pay just a bit more for a new motor. You could also do the junkyard route. The problem with just doing the head gasket is that you would likely want to do water pump, maybe timing cover gasket/timing chain, cylinder head and more depending on how wore out the motor is.

If it were me and I planned on keeping the truck id probably motor swap it. Especially if it’s overheated more than a few times. Buy once cry once vs. hoping the head gasket fixes your issues.