Buying a 727, what to look for?

I'm going on sunday to pick up a 727 for my BB dart project and would like to know what I should be looking for/at?

I'm buying it as a core but any input would be great. Do they crack in certain spots?
Anything I should definitely be looking at?

The Trans will be going in a 71 Dart with a 440 and B&M shifter.

Thanks for your time and advice.