I know, the Holley 4150 in 1957. I meant the 1850 List

Kultulz,
I know, the first Holley 4150 was on the 57 Ford, I recall driving one. I show that one as a List 1272, a 390cfm version.

What I meant about the "List 1850" variant was, the "1850" is so common today. If you want a 600cfm Holley, on the wall of many auto parts stores there's a brand new "Holley List 1850" hanging there, the generic $20.00 swap meet Holley. I just didn't know, it was that particular List 1850 number that was first used on the 58 430-4v.

And to think I tuned the idle on ours and didn't even bother to look at the list number!