UD Pulley Question

[Ny Mustang Guy]

whats up.. I Currently have UD Pulleys on my ride.. My Alternator took a crap on me and I ordered a new powermaster 140amp street alternator. The tag on it says at idle it is rated at 100amps.. and highway at 140....

I am curious as to if I should put the alternator UD Pulley on it or not?.. THe alternator pulley I have is much smaller than the stock one on the powermaster.. will that take amperage away..or give me more @ idle?

Thanks