Tips on installing Doug's on 68 A body

Pulling out the old 318 in my 68 and dropping in a new motor with Doug's.I am thinking pull the old motor with the tranny.And then reinstall the motor and tranny together.Can I drop the engine in with both headers bolted to the engine?I am thinking pulling the passenger side torsion bar or maybe both torsion bars to give myself plenty of room.The Idea is not to beat up or scratch up the Doug's while I am dropping in the engine.
And I really don't want to drop the K frame and put the engine in from the bottom right now.