Alternator upgrade ??s

I have a BB 512 with MSD ,elec fuel pump, Fans , ect... Running the stock 65 amp with external regulator
Is there a simple Alt upgrade to 125 amps and LOW RPM CHARGING (my issue)
I see POWERBASTARDS has a 140 amp for 350 dollars . Can a stock external regulator handle 140 amps ?
Is a One Wire a good option ?