Sounds like a win-win situation for me, since I have the 1.7 Cobra roller rocker arms and a HO camshaft lying around. And I am concerned about mileage.

I actually happened to check the camshaft for straightness by putting it between centers on the lathe at work. Surprisingly, it was about .050" out! It took a huge amount of force with a machinist's jack under the center journal to straighten, and the boss was a big pain as well when he caught me messing around (even though it was a Friday afternoon).

I'd never checked a camshaft for straightness before, but I imagine a bent one, if it could even be installed, would wipe out the bearings pretty quickly.

My ebay rocker arms also had several cracked pedestals and several of different heights. Luckily sets of new ones (16) could be ordered cheaply a couple years ago.

The moral- check everything, particularly with used parts.