You should definitely get one! Your Giulietta looks great, ever rarer than the Ghibli II these days.
Each time I see old Alfas it makes me miss my 164.
Shame to see those Porsche-'products' clogging up the carparks, but you can't have it all. eh?!
No, you shouldn't necessarily be seeing 70 degrees C downhill- but I'll tell you this; if it had a real problem- it wouldn't be pulling properly as the fueling would be wrong.
mabey you've got a sticky thermostat- a fairly inexpensive bit of work as it's well sited.