440 six pack high idle

The issue with manuals is they refer to correct for the year/model parts. Your car is a hodge podge so you need to know all bits outside of the manual.

on the 6bbl it’s easy. It’s basically a vacuum secondary 4bbl. The center are the primaries. The outboards are the secondaries. Isolate the primary, make sure the secondaries are closed fully, and work with that. Once that is up and running right (you can actually drive it just B on that one) then worry about the outboards.

Edit- the dieseling only happens because there’s an air leak somewhere.