Tuning my 360 with a wideband.

As the load increases, the AFR should be fairly flat to a little leaner. Only when the load gets very high that a richer AFR is needed. If ithe engine feels like its losing power or being held back and then power kicks in when you push the throttle down below 6.5"Hg, then try the 9.5 PV. If its pulling strong until you push the throttle open enough to drop the vac below 6.5, then it slows down briefly, then try a 4.5 or 5.5 PV.

This is one of the harder things to nail down even with a WBO2 and datalogger. A shop with a 4 or 5 gas analyzer and a dyno can figure it out very precisely. But hardly anyone has access to a place like that. So we have to do the best we can with what we got.