I helped put a 79 motor in a 78 a few months ago. We pulled everything out at once and then put the tranny/t-case on the 79 after turning the fly wheel. Quick job. It was easier getting it out than putting it all back in though. It's easy to screw up the motor mounts fwiw.
"If you compromise the process you're an a$$hole when you start out and you're an a$$hole when you get back."
"If you don't go when you want to go, when you do go, you'll find you've gone."
"We shall meet in a place where there is no darkness."