not sure if this is the totally correct place to post this but i need help..

i have a 3.5 water pump pully. 3.00 crank pully and a 1.74 Alt pully the alt will run off the water pully side... and i just bought a 100 amp alt ( power master) from summit PN# PWM-27296 i think it was a 12si
is this setup ok? i really only have the choice of changing the alt pully ratio at this point but not by much..
its on a 496 max rpm for motor will be 6500 - 7000 with 4:10 gears turbo 400 4000 stall... 69 chevelle with elec fans not bought yet i am sure i left something out....

all help would be great!!

I would post it in Engines. This is more of a mechanical question.

Good Luck
Chuck