Will work whichever way it is turned, you will need to change the "fan" bit on it though for cooling if it's the sort with external bladed fan between pulley and alternator.
Manufacturers been doing it for years, although a alternator can be run either way, some other types of generator cannot, there are a very very few oddball tiny french paris rhone alternators that are single phase that would get killed running backwards.
Chevy have done this on(some) the vette due to space problems
You'll be fine go ahead, just be aware of heat and the fan.
tabetha