4 speed transmission id abody?

It's an a-body trans, if it has a flange for the driveshaft it's older with a 3:09 first gear.
There is a large and smaller diameter output shaft for slide yoke.
After 50 yrs, there's no guarantee which gears are inside, you need to take the side-cover off and ID the gears from pix at this site.

http://www.brewersperformance.com/orderinfo.php