I am almost certain that all 60es that came in the 1/2 ton trucks had the deep filter. Other vehicles such as the F-body, H3, and Colorado that are equipped with the 4L60e had the slim filter.

If you have never done a tranny before, you might either need to read up on the rebuild of one or have someone around who has successfully torn into one. There are special tools required to set the tolerances of the 3/4 clutch pack and the pump.