vacuum gauge to solve idle issue

Secondaries are usually a secondary concern. :D
I also agree on the choke setting being too far closed, and it's easy to see what the engine wants for choke just by starting the engine with the air cleaner of and pushing the choke open with your finger while it idling.
It'll smooth out where it likes the choke.

I doubt that carb is too big being a 600cfm, but I will tell you that I ran #.100 jets in my 1406 in the primaries and it was too rich for the 318 no matter what needles or springs I used. (I live at 5,500 feet elevation and that makes a difference)
If I remember I changed to #86 primaries? and it straightened up.
I'm running #90 in the 5.9 Magnum, but don't remember the needles in it, so that makes that statement pointless. :D