I got a used Holley Pro-jection (2bbl) system that I'm considering swapping into my 350 9C1 TBI.

However the injector connector pigtail is missing.

Does anyone know what the part number that 4 pin connector is?

Just curious but doesn't the projection use a high impedance injectors?

If it's anything like the 2bbl replacement TBIs that Holley sold as "interchangeable, emissions-compliant" substitutes for the original TBIs, there is an "old" injector style and a "new" injector style.

If the injectors have a rounded, rubber cap over the top, they're the old style.



If the injectors have a molded plastic connector for a plug-in harness, they're the newer style. Holley has replacement harnesses. Not cheap!



If you have the newer-style injectors, look at a Holley harness p/n 534-167.

https://www.summitracing.com/parts/hly-534-167.

I had to order one of these for my 502-6 replacement TBI unit. I also ordered a pigtail to plug into the 4-wire molded plastic connector which would then splice into the OEM harness.

Thanks so much it is a newer style.

So you are saying that a pigtail like this
http://www.ebay.com/itm/GM-Ignition-...RTiuhS&vxp=mtr

would work?

If I use this, I was going to drive it with megasquirt or an EBL ECU.

Looks right, based on what I remember.