Strange mix of parts. The side cover and tail casting are from a 1965 Muncie. The case casting date is Aug. 29, 1968.
The "13" is (1)Chevy,"3" (not 8) Chevelle, "B" Baltimore, MD assembly plant, 114807 is the VIN, and 3925660 was used for all Muncie 4 speeds. As they say, parts is parts.
Thanks to Covin's Chevrolet by the Numbers.
Andy
