I have a rubber line for the rebuilt “cardone”. Tried with vacuum line attached to the adapter plate. Set at idle the timing marks to 12 b t d c. When I reattached vacuum line it advance a good 10-12 degrees. So at idle it must be 24 degrees advanced. Then wrapped out to maybe 2000 rpm it bumped up to about 34 degrees advanced. Getting better. Will drive in to town tomorrow 15 mi. Will likely switch ports as you as you suggest. Curious if vacuum affected by that pvc valve from valve cover. Should it be plugged also? Definitely getting better. Set idle down closer to 550 rpm. 4 speed manual.