I got some time tonight to test the .071" and the .067" IAB's. The following show the results:

-.075" -.071" - .067"
30mph 1700rpms 17.0- 16.6 - 16.0/16.2
40mph 2200rpms 16.0- 16.0 - 16.0
50mph 2500rpms 15.6- 15.6 - 15.6/15.4
55mph 2700rpms 16.0- 15.6 - 15.0/15.2
60mph 3100rpms *13.8- 14.0 - 14.0/14.2
65mph 3300rpms N/A- 13.8/14.0 - 13.8

* This could have been a wrong note taken. All of the above tests were done during a windy day. I did my best to keep the throttle even.

.071/.067 notes: 67 deg.
These numbers are after I retuned the carb for best in D idle vacuum.

My light accel at all speeds was 13.8/14.0 with red cam and .037 squirter. This setup should change after I richen up the transition circuit.

My N and in D A/F numbers richened up to 13.6 (.071) and 13.4 (.067), but it seems to like those readings. I had smooth light accel from a stop on each IAB size.

I am still lean on the transition below 2700rpms but above 2700rpms, the 66 primary jetting is looking good.
Is it time to swap IFR's from the current .028" to .031's, or go up to .033's?
I only found three of my .031's, I need to dig some more. Would it do any good to stick the .031 IFR's in the primary side only for a test since I only have three?

Thanks