I've noticed several posts on this site flaming JCI (Johns Cars Inc) and I would like to add my 2 cents worth. My experience went like this. One of my first two boxes came totally destroyed by UPS. Fan broken, fuel pump MIA. John replaced the stuff immediately and he filed claim with UPS. All the pieces-parts fit great. I used his motor and trans mounts, AC kit, vital fluids kit, fan, and fuel pump. I used JTR's radiator and headers. I also got my drive shaft from John's. I felt it was a little short and called him. He asked for measurements for what I wanted, built it and sent it out. I removed the old one and returned it to him after the new one showed up. The difference may have been because of the GTO T56 instead of the Camaro/Firebird trans that the kit had been designed for. I also had John re-work my stock tach. Upon start up, I had no needle movement at all. I returned it to them, apparently the LS2 computers are sending a very different signal than any thing else before. It took about 3 weeks but they researched, reworked and sent it back to me. I don't know what they did but checking it out compared to my predator programmer, my stock tach seems to be about 50 rpms off (high) at idle then gets closer as the revs climb. I am totally impressed. With the kit I was able to do the swap from engine pull to first drive in 5 weeks only putting in a few hours here and there- less than 30 total. Sometimes on the phone John and Mike seemed like grumpy old farts but the treated me very well, and I found their products to be top notch. I did have to read the manual a few times for it to make sense. Just my humble opinion.
Mike