I'm thinking it's all good so long as that's not just another run of mill J.Y. 4.3 simply tossed in there by an operator who's just trying to flip the car. A 5.0 is cool, a 5.5 is cool, a run of the mill J.Y. 4.3 is not cool. I wouldn't be looking for the M.B. numbers just to confirm it's a 4.3 but rather the AMG numbers which I'm sure are there somewhere if that's one of the genuine AMG breathed upon 4.3s.
Regards, Eric

__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.