Yeah I see what you mean. I put the driver's side header in today and it was a grade A nightmare to install. I had to get the car way up in the air and then use the bridge crane to lift the engine so I could wiggle the header in from below. Looks like they are designed to be installed on a lift.

I think the best way to R&R the car will be to drop the K frame, then drop the headers, then pull the engine and trans as a unit out the front. For assembly the engine and trans slide in from the front, trans linkage is installed, starter bolts in, and then the headers. Once the headers are in place the K-frame with suspension and brakes is lifted up and bolted in place.

Kind of sucks to have to pop the ball joints and bleed the brakes every time the engine comes out but I'm thinking those are the hoops to jump thru.