360/904 question 65 Valiant

View attachment 1715050618 Be careful about going to the much newer 904's. They started going to lock-up converters in the late '70's. Older converters don't interchange with those. They can be recognized by a smooth, machined tip on the shaft.
How could I find out which year they switched to lock-up converters? I have a good 1973 727 but want to use a 904.