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yes all engines above that number is ok for unleaded fuel
only carburator is just only carburator and not fuelinjected engines

also from EPC: if your car is equipped with exchange cylinder head...

the answer to that is probably: money
Valve seats in hardened / stainless steel are probably more expensive than standard, so two different versions are made
there is also a difference between...

yes i have read it too
but I also remember that Saab approved for unleaded fuel from the year 85 but only a few years later when we in Sweden started using unleaded fuel
it is also most likely that...

as i understand so 16 valve from -84 is ok for unleaded fuel and the 8 valve from -85 is ok ( or late 84, engine number E51661 carburator engine only ).
i think it is an good idea to have a god...

what year is the car manufactured?
model?