If you are completely un aware of the actual condition of the trans, then having a transmission shop take a look at it would be highly recomended. Maybe even going ahead with a rebuild of the unit.
If you are pulling the transmision out of the vehicle yourself, then you can pull the brake/clutch pedal assembly out at the same time. You will need that since your current configuration does not have a clutch pedal. When ya pull the manual trans out of old junk vehicle, you're gonna need the fly wheel
plus, do yourself a favor and install new clutch while you are doing the swap. Might need to have flywheel slightly machined. Might even consider getting neew fly wheel, if the old used one is bad