Stock alternator up to the task? If not, how many Amps will I need?

I'm running an OEM/remanufactured alternator in my car currently (pun intended).

I am about to set up a pair of shrouded electric fans in place of the stamped OEM fan. Unfortunately, I don't have the specs for the fans. I bought them along with my Champion radiator (matched by the rep who seemed to know what he was doing) a few years back and never hooked them up. I also have a set of 55W Hella fog/running lights that I would like to run.

The fog lights will need less than 5A when on. Not sure about the rest.

Will a stock alternator do the job? If not, can someone recommend an affordable alternative? It doesn't have to look pretty.

Thanks for any advice.