Thrust issues with AFR gauge and Brawler carb

Dusterguy said
I occasionally like to drive it hard. I bought the afr meter to get most out of the new carb. And if I could get better fuel mileage that would be a bonus.

Im aware that afr meter might show falsely reading in idle with big cam overlap. I tuned idle mixture with vacuum gauge to get maximum vacuum. At that point afr meter shows 12.5 to 12.7. Any leaner than that idle quality start to get worse.

At 3000 rpm cruise speed AFR is 14.5. At slow speed steady driving around 2000 rpm afr gauge shows 13.3

Here is more info what you asked:

-Plugs are about 2 year old. NGK BCPR6E
-Electric choke is working properly
-Have not cleaned up any passages in carb. Just visually inspectetd inside that there is no debris or anything
-Idle air jets 70
-High speed air jets 31
-No emulsion jets. Just 4 empty threaded holes in metering block.
-Idle fuel restrictor jets are at the top of metering block. Had not any markings so I dont know what size they are.
-T-slot expossure, have not yet looked up.
-o2 sensor is maybe 5 to 10 inch from collector.

-PCV is in use
-Timing 20 at idle. Total timing 35. All in at 2500 rpm. Plus vacuum advance 7.

Engine is 360. 10:1 compression ratio
RHS iron heads from IMM
Comp Cams extreme energy 244 at 0.050" https://www.compcams.com/xtreme-energy-244-252-solid-flat-cam-for-chrysler-273-360.html
RPM intake
shorty headers

I quoted this post again so I don’t have to keep going up and looking at it on my phone.

The 70 idle air bleed may be fine depending on what size your idle feed jet it, or restriction as that is used interchangeably.

IMO that MAB is way too big. IMO .026 is a better starting point.

What happens is that big main air bleed will start the booster sooner and then you get rich because you have too much overlap between the main circuit and the transfer slots.

A smaller MAB will delay the start of the boosters.

FYI the MAB has an opposite effect on WOT on the main jet.

The smaller MAB will be richer at the same jet size than a larger MAB. So the MAB affects both low speed (low air flow) fueling and high speed (high air flow) fueling but in opposite ways.

In other words when you go to a smaller MAB you will be leaner at low air flow and richer at high air flow.

A bigger MAB will be richer at low air flow and leaner at high air flow.