The clutch on the alternator does as above, also reduces the dragg it puts on the belt and the engine witch in turn gives longer belt live and lower fuel consumption and emissions......on deacceleration, yes deacceleration, you will not benefit from the latter on your V8.
The intellegint alternators are NOT intellegent without the engine control unit, the engine control unit "knows" what type of battery is SUPPOSE to be fitted and different batterys need different charging rates, a AGM battery for example needs to charge at 14,4V to charge propperly and is different from a Calsium battery and different from a normal lead acid battery. I see every day of my life how people try to be imtellegent and fit the wrong battery than recomended to save money, and then things go wrong and cost absurt amounts of money to fix.
I have no clue what vehicle you got the alternator from, I dont get the lingo, but I think you are safe.