How would I know which trans I have? Is there a specific part number I need to look at to tell me if I have a post 71 trans that has the correct gearing?

I'm having the same issue with the heads on my AAR. I have 915 heads but some are 1.88 and some are 2.02 with offset rockers. The 915 heads have a "A" thru "E" after it? Been trying to figure out how to differentiate between the too. Heads are on my current motor so I cant see the valves.