The quick answer is that you can. I'd recommend using an alternator that will more than meet your needs. You'll never regret having a higher output alternator... but you will regret not having enough. Upgrading to an ambulance alternator is a common upgrade for those with a regular alternator.
That said, at least on a '97 Powerstroke, the alternator mount is different for the 215 amp Mitsubishi alternator than for a regular one. When mine needed to be replaced, I opted to find another ambulance alternator despite it's slightly higher cost It didn't require any new hardware or wiring to swap it in.
What alternator are you looking for? Have you checked ebay?