First time motor pull

If your transmission has no drive after sitting overnight, it could be "morning sickness". My 65 Newport is like that, despite a "professional" rebuild" (if that what you can call Cottman). I since found a valve body kit to fix it. An easy trick is to idle in "N", which fills the torque converter in <10 sec. Idling in "P" or "D" can take >30 sec. If slipping between shifts, that is a different problem.