What is the recommended a/f ratio? I have a 2270 with 44 idf Webers. I have a AEM monitoring gauge Thanks. Dave

Will take a stab @ 12 to 1 ,I want to get one of them myself, .

Depends how stable through the full range, 12.5 to 13.5:1, but on load and cruise you don't want more than 13.5:1 at any time.

Just as an FYI I'll add that with LN Nickies you can push the AFR as high as 14:1.
Iron no more than the 13.5:1

My T4 powered VW bug has Nickies and I run 14:1, you can do this because of the aluminum cylinders superior heat transfer rate.

Is max 13.5:1 at WOT? My car runs 12.5:1 at WOT but cruising down the freeway at 70 mph and light load at the very top of the idle jets the AFR is ~16:1. The second I put my foot into it to climb a grade it drops back to < 13.5:1. I only see CHTs >335F on a long steep grade, then CHT can climb to 375F. Thanks for clarifying.