727 C body-A body?

Only thing I know of to watch for is "some" motorhomes 'n heavy trucks use various short shaft 727s, some have a great big emergency drum, and some have some sort of torque multiplier, and of course the ones built to bolt up to a transfer case.

The one in my Dart is out of about a 77 Dodge B200 van

and of course Fishy already mentioned the shifter mount ears.

And last, a few are "lockup" which can be easily id'd by looking at the valve body with the pan off, or if the converter out, the splines on the front shaft will have a smooth area similar to a stick shift pilot shaft.