(2)450 DP's vs (2)750 DP's

Mattax said
That's even leaner than late 60s CAP/CAS targets! LOL
IIRC '68-'69 targets were 14.1 and idled around 700 rpm for most engines

Yea. I’m spoiled by looking at lots of EFI data from my truck and watching a dead steady o2 on that. I strive to make my carbureted stuff run similar to that. Lean idle and cruise, slightly leaner light acceleration and fat wot.