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The fumes are most likely coming from the rear hatch, or the tail lights. Check the rubber for the hatch, if it's worn, that's probably the cause, or else the rubber around the tail lights where they mount on to the car.

You should notice that the fumes get worse when you have just one window down, but seems to be less when both windows are up. The wind rushing by one window down creates a vacuum drawing air out of the cab and if the rubber is worn in the back it sucks that air (fumes) up into the cab.

As for the carbs, probably SUs ot the dual Webers. Tripples will require some set up and jetting which for some is too much to deal with. I'm not familiar with the 4-brl set up so I can't comment on that.
 
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