I have a FAST XIM box with wiring harness. I purchased it from hartline performance in late 2014. I got the car running in late 2015 and put at most 100 miles on it.
The harness is for an LS1, but I was using it on a buick v6 with a crank trigger and hall effect cam sensor. You can re-pin the crank and cam to work however you like. I will include a bag of extra pins. If someone wants this for a v6, I have the caspers coil harnesses and coils also for $300 more.