Horrible MPG/Fuel odor troubleshoot

TrailBeast said

So what's the inside of the tail pipes look like? (black and sooty?)

And does the car have places where the exhaust can come up from the back, like a trunk seal or body plugs (or other holes?)

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A little black in there I'd say wouldn't you?

Car is plugged up pretty good, must be something in the carb dumping too much fuel. I guess this carb was set up for the original M1 single plane intake.