My buddy and me got the jimmy swapped over to HEI today. Aside from a small electrical fire everthing went pretty smooth. Speaking of smooth... the truck runs and drives like a dream. Like a brand new truck! My wife even like driving it better since it doesn't sputter and stumble. Awesome throttle response! I wish I would have done this a long time ago. Special thanks to everybody who replied to my 'HEI swap question' thread Bye, bye high maintainance.... hello, high performance. CK5 is the best thing that could ever happen to any truck.