How do i tell if i have a lock up or non lock up trans?

So since my motor is out and curiousty set in I went out and looked at my tranny and it has the lock up shaft,the converter looks like any other and I think I only unhooked two wires.I know the 318 is a 1975 butI guess I'll check the numbers on the tranny lip to see if I can tell what year it is.BTW I'm putting a 10:1 340 in the car does anyone think this will be a problem?