360 Advice Needed - Autocross / Street Engine Build

My 92 dak 318 with trailer tow had a service bulletin changing fan clutch from 185 with 7 blade 3" pitch fan to 195 with 9 blade 2 1/2 pitch fan and went to a 18 lb thermostat
3" fan was really loud
I'm looking at the GM 11 blade fan to test
all this is serpentine reverse rotation stuff