Check for numbers stamped into the reverse lever (longest one):
"These numbers are found stamped into the Reverse lever:
2336= '64-'65 A & B Body
6353= '68-'69 B Body and '68-up A body
7174= '70 only B Body
7180= '70-'74 E Body and '71-up B Body "
Quoted from Moparts member John K.
jt