390 cfm Holley help.

That was an 8007 series, perfect for Slants. Yes, it was a vacuum secondary carb. Keep your eyes open, they pop up all the time.

One caveat to buying a used Holley though: People who think they are carb "experts" tune on them until they will not work at all. Then, they dump them and go on the Internet whining about junk Holleys. They are real tough to get back into shape if you don't know what you're doing.