New to this site .I have a 68 Impala ss427 custom coupe that has it's original #'s match drive train and body panels,trunk,floors. On the data tag on the firewall it says n372 in the upper right corner of it above the paint code.it was built in Los angeles I've had about 20 65 -70 b bodies in my time and never saw this before . Anyone could help me with what this code is would be appreciated.