LOOKING FOR ADVICE

The only advise I can give for big projects like you describe is to first, really do the prep work first as in HOMEWORK! On what’s needed.

This will pay off when the bigger project comes into play. The engine/trans swap isn’t to bad at all but missing a part and waiting a week to get back to it totally blows.
Just think ahead. Write a list and go from there. Driving and fixing at the same time isn’t easy.

Small projects like floor pan replacement, interior fixes, etc... can be about half done and still be able to enjoy the car. Plan your time wisely.