another option is the Holley HP efi.
once you factor in the cost of a new harness, the PCM purchase, a tune you are in the $1000-1200 range
the Holley HP efi system is not much more and you can pretty much tune it yourself. Only real tuning needed is cold start, hot restart, idle, and tell it the timing you desire. upload a file from another LS engine that is close to yours and that is your base file that you improve upon.
I have one in my FD and it drives better than ANY tuner has ever done using a stock PCM and HPTuners. the more radical your engine combo.... the better an aftermarket efi will make it drive. The install is also rather simple taking a wiring fearing person only 2 hrs to get it all in place reading directions the entire time.
