700r or what is in my truck?

[love trucks]

I just bought my 62 short fleetside last week it has a 454 automatic, bought from guy that bought a package of old cars he did not know much but new it was a good running 454 with a700R overdrive trans. I got it running and he was right about it benig a good running 454 ( it is sweet) I don't know how to tell what trans is in it. It has no TV cable. only driven around the block a couple of times (not tagged yet) seems to work OK did not go far enough to shift through gears but would like to know what is in it.
Tell me what to look for to tell what it is.