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Also noticed that the 2F is not getting up to 180*, more like 130*; so I’m thinking the thermostat my need replacing.
Just an update. I did find a vacuum leak coming from the base of the carb. I pulled the carb off, had a good look through it, replaced the screen at the fuel inlet, checked the jets, and did a good once over. Everything had been dipped in carb dip last year, so I just sprayed the ports with air or carb cleaner and inspected what I could. I put everything back together and installed carb only to find a second vacuum leak where the primary barrel butterfly shaft went through the far side of the carb base. So I pulled the carb a second time and swapped bases out with a spare that I had. Installed everything again and this time I had a vacuum leak at the carb base again. I went through my carb rebuild kits and found a two barrel carb base gasket. I was under the impression that the carb base did not need the gasket, but I installed it anyway. This took care of the vacuum leak so I am happy.
Went for a test drive today, I was able to get up to 65mph with out the backfiring a few times on the drive. Periodically I would get a backfire out the tail pipe, but not nearly the same as before. I’m not out of the woods yet, but I’m feeling much better about the setup.
BTW, I continued on with the desmog process and only have the charcoal canister hooked up to the manifold vacuum via the VSV. I have the carb base vacuum port run to the inside vacuum advance on the dizzy. The power valve is hooked up to the throttle positioner. I need to buy some 3mm vacuum hose to replace the lines that I currently have. Some are nice and tight and others not so much.
Also noticed that the 2F is not getting up to 180*, more like 130*; so I’m thinking the thermostat my need replacing. Figured I need to get the engine up to temp before doing a valve job and dialing in the carb.
Thanks again guys for the input and suggestions.