I don't know of any LS swap that was done that did not have a range of issues that needed to be sorted, dealt with, trouble shot, and resolved over about a year's time after it was up and running.
They range from overheating, electrical issues, gauges not right, not running right, trans shifting like dogshit, etc.
If anyone knows of any individual who has nailed a swap in very short order and has a reasonably tolerable standard of how stuff should be, I would like to chat with them.
Be aware that I have nothing against LS swaps at all. I have lots of issues with doing something that takes so long to get dialed in or get left to be crappy and just put up with. That and most I know of don't make the AC work which ain't gonna fly in Chris's world.