Getting fumes in the cab real bad

The first thing I would look into is excessive blow by filling the engine compartment with crankcase fumes.I had this happen with a plugged up PCV system om my Valiant wagon. If your exhaust is tight there is no other cause for fumes other than this
Good advice here as well, I will definately look into that as well. Lot's of this stuff I would have thought about 20 years ago with these cars, but I have been out of the game so long! I am missing both those vents, the hood seal too, and the vent on the fuel is bad too. Damn, I got it everywhere.