Electronic fuel injection systems are now standard equipment everywhere, but adding EFI to an older engine with a 4 barrel carburetor usually involves a fair amount of plumbing and wiring and the result doesn't look like the system you replaced. RetroTek Speed has a solution with a bolt on EFI system that not only looks like a 4150 series 4 barrel carburetor, it will bolt on in place of the carb on your current manifold, accept the standard air cleaner or work with whatever air induction system you're using now.
The system comes in two models, the Boss750™ and Boss1000™ and they work with standard carburetor linkages and components, including nitrous and superchargers. The actual fuel injectors are hidden in the "float bowls." A pressure regulator matches fuel pressure to injector demand.
RetroTek uses Smart Tune Technology (STT) to manage the system. A unit about the size of a paperback book, connects to your desktop or laptop computer, you choose from one of the basic programs that best describes your engine, then install the box in your car. The wiring harness simply snaps into a connector on the injector body.
Add positive and ground leads from the battery, an ignition lead, a lead from the coolant temp sensor in the intake, and snap in a wide-band O2 lead, and you're ready to go. Everything else is pre-wired, and the injector body is an all-inclusive EFI system. No fuel rails to plumb, no extra wires to run or sensors to install, and no headaches. Hit the ignition and the basic tune will get the motor started. At that point the STT System will start checking air/fuel ratios 60 times per second, until it creates it's own fuel curve. Drive around the block and the system will continue to learn, until engine operations reach peak efficiency. As your driving style changes, the STT will continue to adapt.
You can change the tune later with a laptop if you desire. The system works with a wide variety of ignition systems plus standard throttle shafts, cables and transmission kickdown cables.
The RetroTek Speed Bolt on EFI system was just introduced and will be available in the Spring of 2007. This could start a big move to EFI among those who want the precision of fuel injection but have not been able to find a good setup for their current manifold. This looks like a really nice high tech solution for moving past the old carburetor technology while still retaining the retro look. I like it
Link: RetroTek Speed