Hey so I scored an 01 5.3, engine harness, pcm and a complete 4L60. Is is better to just use the harness in my truck and do a 411 pcm swap, or use the 5.3s harness? If I use the 5.3s harness does the 0411 pcm still need flashed? And how do I connect the rest of the truck to the engine, trans pcm? Like guages, lights, climate control, radio, wipers ect...

Any advice would be greatly appreciated

Thanks