So today, I put in a new power valve, still bogs, new acc pump, still bogs, re-check timing, spot on. Electric choke is working correctly. Re-check for vacuum leaks, can't find any, vacuum gauge is nice and smooth, no erratic movements. No audible misses or sputters while at idle, or when reving in the driveway. Have good voltage on volts gauge. DUI is getting voltage direct from battery through a relay. Re-checked all plugs for fouling, they are nice and tan, and clean. Re-check gap @ .50
Only rubber fuel lines are the one's right at the tank, a short 4" piece up front, from the steel line end, to the pump, and from the pump to the filter. I don't see any leaks or moist spots on any fuel lines, and other than the rubber lines at the tank, which I can't see by myself while trying the re-create the symptom, no signs of collapsed hoses. Filter is a brand new WIX, correct position with return nipple at 12 o'clock. Fuel pump is brand new, and working.
I did recently fill up with about 12 gallons of gas from a high volume station. Yesterday, I plumbed a 5 gallon gas can with fresh gas from a different station, into the newly installed pump, with clear hose, and tried to run it. It started, idled, and reved fine, bogged under load.
This carb was a new MC2150 from the eBay guy, and after getting it dialed in, has run very well. It is not dirty and worn out, no junk in the bowl. It's less than a year old.
I'm going back out to re-check float level, if that does not help, I am at the end of my abilities to diagnose this.