1967 A-body Big Block 383 4bbl 727 Automatic Transmission

chrysler interchange manual shows the tranny as number 11.This is what it says,I quote the page.(part number 2801543)
Usage:A727 automatic,1967 Polara,Monaco,newport,and Police car with 383-ci:1968 belvedere,Coronet,charger,fury,Monaco,polara,and newport with 383-ci two barrel.
Your first 7 digits are good,I think some one screwed up the 10,000 day calender and the sequence number as you only have 7 of the 8 digits.
Like it says in galens book,there are two versions of this tranny in his book,and its done with the 542 units and the 541 units.This is where the confusion is,what is right,what is wrong,what is correct.If its a real deal unit,i will be the first to say congrats to you,but it i see 2 versions,I have to say to my self,why and ask questions,as you would,mrmopartech
This may be the problem,if some one did not stamp the number 2 before the 3761357 this could be the problem,as the date code would be then,monday 29 jan,1968.