The Jalopy Journal
I use them and the ones Charlie makes for the Holley 94's here in my shop. If you can "read" a spark plug, go for it.
Don't forget that the Rochester 4 Jets came in two different base sizes. Buick used the small base, Chrysler, Cadillac, Chevrolet used the bigger...
Float Height is important, but most folks forget about "Float Drop". With four floats, unlike the AFB with two, the 4 Jet is a blast to set up....
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The Jalopy Journal