I removed the old QuadraJet carb and installed a custom EFI unit from Affordable EFIs. The kit included just about everything needed to do the job, and uses mostly off the shelf GM parts. The throttle body assembly is from an early 90s Chevy truck with the 454cid (7.4l) engine, and the ECM is a typical late 80s to early 90s GM unit with a custom programmed PROM chip.

Included was a remanufactured full electronic HEI distributor (a vast improvement over the original point-and-condenser unit), fuel pump and filter, fuel pump relay, reman'd 680CFM throttle body (with new injectors and sensors), an adapter plate to bolt the 2BBL throttle body to the original 4BBL Toronado intake manifold, new oxygen sensor, MAP sensor, and coolant temperature sensor, along with one of the best looking custom built wiing harnesses I've ever seen (and I'm an aircraft electrician).

This is how the mighty (although VERY dirty) Olds 455 looked with the old QuadraJet carb and point-and-condenser distributor removed, ready for the install to begin.

I had to slightly modify the adapter plate. Because of the low profile of the Toronado intake manifold I had to grind a bit off the front left corner (the bottom corner in the picture) of the adapter plate to get it to fit.

The conversion progressed quickly, it took about 2 hours to get to this point.

Here, everything in the engine compartment is wired and installed, except the air cleaner assembly.

I mounted the ECM inside the coach, on the backside of the firewall under the sofa. I had to drill a rather large (2.5" diameter) hole for the wiring connector to pass through the firewall. I filled the hole with 3M foam in a can, great stuff! The smaller wire harness on top, going to the left side of the coach, is for the Check Engine light.

I fabricated a bracket for the MAP sensor out of .060" aluminum sheet, and fastened it under one of the passenger side valve cover bolts.

I'm not happy with the 9" air cleaner, but it's all I could fit because of the low profile Toronado intake manifold (with the throttle body mounted over the larger rear secondary openings) and the larger HEI distributor. I'm still looking for a more suitable, larger air cleaner assembly.

All together, I'm very pleased with the results. No more pumping the accelerator to start a cold engine, incredible throttle response, and the same great performance from sea level all the way to 9000 feet above sea level. The gas mileage increased by almost 2 miles per gallon as well.