904 I D needed. /6

I have a 904 that I want to freshen up but need to figure out what year it is before I buy a kit. The guy I got it from couldn't remember .

The # on the case on the pan rail is ( the first letter I can't make out for sure)

1(?)- PK2892027 2292 0000
Has a big 871-2 cast in the bell housing.

The guy said it was a 78 or 79 but wasn't sure.If I remember correctly they started making the lock up converter trans in 79. Thanks for any help. AL