Here's another company to look into:
http://www.affordable-fuel-injection.com/ ......great people to deal with!
I pieced together a system but, haven't gotten around to installing it yet %)
I sourced the throttle body and computer from the wrecking yard, saved the pumps and adapter plate from my old Holley Pro-Jection system (biggest POS ever) and had them put together a harness, supply the remaining sensors and burn a chip to work with my motor specs.
I have been thinking switching to the Howell...I have a POS Pro-Jection on my rock crawler and I can't get it tuned...I'ts a freaking nightmare.
A buddy of mine races and uses the Howell system in his buggy...he swears by it...said he installed it 4 yrs ago and hasn't had to touch it since.
Adventurous 4x4 sells Howell kits. Ask for Randy Wood. He is an early bronco guy.
http://www.adventurous4x4.com/home.php