header install
It's actually quite easy if you pull the steering column and unbolt the steering box from the K-member. It only takes about 20 minutes to do that and the headers will slide in just like the passenger side. After you have the header in don't bolt it to the block until you have the steering box bolted back down, you need to be able to move the header around to access the box bolts.
You don't even need to un do motor mounts and jack the engine.