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

I aim for mid to high 14s for idle afr, if I saw his ~12.5 numbers I’d be leaning it out.
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