Check this out guys... My lean idle ended up being from the header down pipe ball flange being loose. Apparently the exhaust leak just messes up the AF reading at idle. The primary main however, still felt and read lean. I swapped the 140 main jet for a 150 and it is right in the 14s on the primary so I think it was a good choice. Also advanced my timing a couple degrees to get the idle vac back to 17. Idle vac has been dropping with the temperatures which is consistent with my seat of the pants winter tuning over the years.
The conclusion is that lower ambient temps want slightly fatter jetting and slightly advanced base timing.
