I am looking to buy a new wiring harness for my 66 Mustang but I wanted to ask the differences between the Painless and the EZ harnesses? I did a search and found that the EZ is GM coded but otherwise they are pretty similar. My first thought is to just buy the EZ wiring harness but the huge difference in price makes me second guess myself. Is the Painless worth $300+ more than the EZ and if so what does it feature that the EZ doesn't? Thanks for any help and/or input.