SL450 US model – when to choked?

Good afternoon to the ladies and gentlemen, I would like to buy a 107er and have a specific 450er in mind, Bj 07/1973. Now the seller indicates this with 165KW, but the US models were throttled, right? Have already seen a table, however, where it says that this can be different depending on the year of construction. Long speech, short meaning: can it actually be that this special SL450 has got a 165KW strong four and a half liter installed???