To answer your second question on operating temp, mine runs between 90 -100 c. I always flip on the cooling fans when the car hits 90 during the summer. This keep it right there even on the hottest days. Hope this helps as well.
I take my Backdraft #408 to SpeedSports in Gilbert, AZ. Ask for Mark or Fred. They have a great shop and I have been pleased with their basic or complex repairs. They also have an in house dyno.