[Smoove1010]

Choice #3 is the method I used. As you noted, it's helpful to have the cam housing pins lined up perfectly when installing the cam towers, and installing the cam tower loose and dry to "register" the heads does the trick.

Once the heads were torqued, I did torque the cam towers down temporarily so that I could insert the cam and make sure that it spun freely without binding, which would indicate distortion of the cam tower due to uneven head height. You wouldn't want to find out that you had a problem after applying sealant.

There are numerous threads about this - some assemble the heads to the cam towers on the bench, then install the heads/tower as an assembly.

GK