No its not , but it just means that either the enfgine or the tranny is not orignal ( or poss. both), it shows you have a non matching no`s car there... is the car a 400 hood car ( w air false air scoops), w 400 grille "arrow head" emblem at center of bumper? If so its prob. a 400 car w replaced motor ,OR if its a 350 hood ( 'flat hood = no scoops), no bumper emblem , its prob a 350 car w replaced engine...
you can decode it from the body tag just in front of driver on the engine side of the firewall, then go to the web page place here and find out...
"his and her" shifter is basically that you can shift "manually" w the auto. shifter , going over to the right in the oval cutout in the shifter slider cover , you get to shift on the right side to ea. gear...slightly push over and forward to ea. gear....takes getting used to...but more äfunä... a TH400 tranny was on 400 cars , the TH 350 on 350 cars...
have fun if you buy it , they are a blast! Bjorn w/ 69 (was 350) 400 convertible