Alternator Fan Not good enough

[socalfandabodys]

I have a 68 chevelle with a 100 amp alternator. The first one I put on was a chrome generic 100 amp alternator. it burnt out after 200 miles and it looked like someone threw a grenade inside of it. I have a concept one pulley system along with the concept one alternator fan. So I got the new alternator a power master 100 amp natural finish. I felt the alternator after a few minutes and it was almost too hot to touch. Yet on my brothers camaro he has a 80 amp gm unit powder coated orange but hes running a stock fan and it stays way cooler. Do you think that the fan has insufficient cooling and should I pt a stock fan on the alternator or should I wait it out and see what happens.