[68 P.O.S.]

Getting ready to pull my engine (350) and trans (TH350) out for cleaning, resealing, etc. From what I've read here, the driveshaft will pull out of the trans as I remove the engine/trans. Sounds easy enough. When I reinstall the engine and trans, what's the best way to re-insert the driveshaft into the trans? This is my first time doing this and didn't find info on it. Thanks!