Yours work good or not: HAYDEN FAN CLUTCH #2765

I had cooling issues with my '67 Dart at one time and tried all sorts of combinations. Problem was solved once I got the radiator the car needed. About the fan clutch, Hayden #2765. Of those of you that have used it did it work well for your car? I put one on my car with a 7 blade '215 fan( A body 340 fan ) and it was pulling some air at idle. Took it off and put a 7 blade 18" flexalite clutchless fan on and there was a huge difference in the air coming through the radiator, the flex fan is way better. I can see that the flex fan is spinning way faster than the stock clutch fan. I am curious if the Jaguar clutch is not made to pull the weight of the stock steel mopar fans because from what I have seen the Jaguars mechanical fans were plastic.