Holley TBI

Without some photo's and part numbers, (off the controllers) what you have said doesn't mean much. Holley seems to have made OEM replacement TBI units, and MAY have even made OEM original.

That part no. MAY have originally been with part of the Holley "Pro-jection" systems, but there were changes over the years...........

Early ones used different injectors, early had these "round top injectors" This photo off the net is OEM, this one has an idle air control, the Holley aftermarket Pro-Jection did not.......



This is the later injectors, which has a retainer spider on the injectors



The OEM and Holley aftermarket injectors could/ probably do have different connectors on the injectors. I bought an OEM one for parts, turned out the harness / injectors is different

REALLY the big thing here is the CONTROLLER. The older Holley controllers, (example) which had the 5 or so pots sticking out the side were not very and were never meant to be very streetable, and never were meant to meet any state smog. They were meant more for 4x4, etc.

But that very same TBI and sensors, when coupled to a decent EFI controller, can be as good as any OEM system, if properly programmed.

I have a Holley Commander system, the ECU is fully programmable, and am using the "old hardware" with the newer, updated Holley HP ECU

You can also "go" with Megasquirt.