I haven't pulled an engine on that car, but many others. Unless you have the equipment to raise and lower the engine and transmission as an assembly on the heavy angle required to get it in and out, I'd leave the transmission installed.
If the car will not have to be moved just block the transmission up in place. If the car will be moved then create a sling and suspend the transmission from strong points on the firewall.
Leaving the transmission in place saves working with the driveshaft, cooler lines, vacuum connection and electrical.
If the front pump seal leaks on the transmission that is the time to change it.
Good luck and keep us posted!!!

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