You can plug a holley harness in and run power and ground and fire it up if you dont want to mod a harness. Its not a big deal really. Its a bigger deal putting a 350 in instead of the stock engine. Just put it all back to stock if you want the easiest simple things. Ive converted a few carb guys and now they laugh at how easy it really is. Wiring and efi is no big deal......if your willing to learn something. If your brain is at full capacity then just stay factory stock haha.