I doubt that you have a PV problem;

How does the car run? If you did not have the O2 meter, would you still be posting about it being rich?

Your data suggests that you are rich in the transition (30 mph). You motor is so big, and cam so small that your signal is very strong in that range and your pulling fuel from all three circuits. You can try lowering your center carb fuel level. It might help a bit. Doing a trial with a wire in the IFR would certainly be informative.

The 13.5 does not bother me, but you could go down a bit on the main jet.

Even though the above post is a valid question , you have the tool - you may as well
get it right since you have the tool . You shouldnt see numbers that low at cruise unless you have all carbs open when you floor it . And even that might be too fat.
You could be as high as 15-16 at cruise and your car might not mind it.
. Cruising so rich will make your car exhaust seem louder..
In my experiences - If it sounds like a 318 at idle - when u get it right , it will sound like a 318 when youre cruising too .
Make sure your floats are in range .
What happens to your idle when you play with the outboard idle screws ?
Youre getting close.

I think there was a bunch, maybe 12, of different part number Holley six pak carbs in 1970, stick and automatic, California ECS stick an dauto trans,CA non ECS,two r three different other part numbers for non CA domestic use as well exports maybe The list number is stamped on the main body on the back of the passenger side throttle bore so you can't see it without the carbs in your hands or maybe with mirror. I'm not sure if Mopar had Holley reproduce some of the 1970 carbs or not I bought a set of 1971 reproduction carbs that came with the original List number with a dash number after the main number, for instance 4404-1 or 4404-2(not a real Holley six pak part number probally but that is what came into my head for this example ) when the origianl number was 4404 with no dash number after it I'm thinking my original non CA center carb. came with 63 jets I had four or five sets to choose from back then Mopar parts hoarder I am

thermostat??? Must be 195
hot restart ok? i.e. turn the key - it runs

This is a balancing act - you have the proper instrumentation - so have at it.

how many turn out on the ctr carb mixture screws?
should be btwix 1-2


try 62 jets first, then try opening up the slot and pulling the idle down with the outboard mixture screws - while having the cts carb mixture screws at 1.5 turn out

don't be afraid of lean afr numbers in the cruise mode-if it has power you are good.

As far as jetting,Holley used only three different sets of metering plates for the end carbs,# 6178/6180 for the 69 1/2 A12 cars,# 34/35 for 70/71 440 and # 41 front and rear for the TA/AAR.All had same 6.5 power valve.Main metering block was jetted according to application manual or auto.Not sure on the reproduction carbs but would imagine not much has changed.

Finally got a chance to test drive it a little bit with the 62 jets. Much better. Idle around 14. Driving around from off idle to 40 or so is much better in the 13.5 range. Cruising at 60 is high 13 to 14ish. It got a little lean when going from a steady 60 to throttling it up to 65. It was in the 15s and hit low 16s for a second or so. But went back to high 13 to low 14s. when settling in at 65. No full throttle yet. I'm going to try and get it out tonight maybe and try a little more tuning.

- ""Idle around 14."" GOOD
- ""Driving around from off idle to 40 or so is much better in the 13.5 range."" Maybe only slightly rich since you are going from idle (14) down to 13.5 at 40mph, then back up to high 13-14 at 60mph. Your A/F is taking a slight rich dip between idle and 60mph. But if you can not tune that out, you should still be fine.
- ""Cruising at 60 is high 13 to 14ish."" GOOD
- ""It got a little lean when going from a steady 60 to throttling it up to 65. It was in the 15s and hit low 16s for a second or so.""
There is not a lot of power required when cruising at 60/65mph. If you don't hear any pinging (or bucking) while throttling up from 60 to 65mph, you should be fine even though you are in the 15-16 range because it does not take much effort to get you there. With a carb, you can only tune so much. My four barrel carb shows readings into the 15's under the same circumstances and my carb has adjustable everything and I can not seem to tune this out "without affecting something else". But what I have found is that this 15-16 A/F "during this circumstance" does not cause an audible ping, so I quit worrying about it.

Nice job and I would now move on to the 50-65mph hard accel (if that is your normal cruising range) and then after everything else is tweaked, then work on the WOT tuning last.