Troy,I have a build sheet for a 70 Charger R/T 440 4bbl 4 speed,and the code in the trans box on the sheet is 676.This may help.

1970 Dodge Charger R/T S.E. 1969 Dodge Dart GTS 440 M-Code 1970 Dodge Charger 500 383/4-speed w/A.C.