4spd identification?

my cousin has a 64 comet that the previous owner converted to a v-8 4spd we are getting ready to pull the 289 out with the 4spd and go roller motor 5spd. how do i tell the difference between t-10 and top loader? or how do i find out what i have??

T10--gears and such are accessed through a cover on the driver's side of the main case. The 1-2 and 3-4 shifter arms are contained on this access cover. Reverse shifter arm is located on the tailshaft.

Toploader--as the name implys, gears and such are accessed from the top of the case through a sheet metal cover. All shift rods are found on the main case and there is no access panels on the side of this case.

This link may also be useful. It tells you where the Toploader came from (if that's indeed what you have).

Toploader ID Chart