for headers install, you must lift the engine?

Nope. Mine went right in from the top. Removed coils, plugs on driver side, and oil dipstick. I have a T56.

I had to take the steering shaft loose to get the drivers side in. Pass fell right in coils and everything attached still. I have AC-delete box on though

both from the bottom up. passenger side I had to snake it in drivers side just about flew in. no reason to undue my mounts. front and rear of the car on jack stands

Driver side i did from the top and passenger side, from the bottom. The 3" collector on the passenger side was hitting the cars frame. Nothing a like heat and hammer cant fix