Autometer A/F gauge question

I am curious about why you think it will be worthless for tuning purposes. You should at least be able to get a good baseline for the cruise, power and idle jettings.
I have my collectors set up with bungs and was planning on doing just what Superdart is talking about. I would spend $200 to avoid 3 days of trial and error tuning ,
not to mention pulling plugs out of hot motors for readings.