Thanks. I now recall that the Dodge TBI did have 4 bolts. I confused it with some GM trucks I was robbing sensors from. Correct, the Holley Pro-jection TBI was from a production GM TBI. It must be upscale from the standard Rochester TBI since Holley sells just the TBI as an after-market upgrade. Otherwise, the Dodge TBI looks similar to the Pro-jection TBI with the same early style injections. People prefer the Delphi injectors on the later Pro-jections. They don't interchange unless you swap the whole injector pod.
