While there may be such activity behind the scenes, I haven't seen Arnold making any overtures toward anyone as conservative as McClintock for administration positions. It would seem to go against the centrist image he's trying to create.
I don't think the problem here is McClintock. It's too many California conservatives selling their support so cheaply. Arnold doesn't need to offer them anything to get their support. If they were more insistant that Arnold needed to meet some minimum standard - signing the no new taxes pledge, making some concessions on gun control, government spending cuts, etc. - than McClintock could serve as a decent conservative rallying point carrying considerable leverage with a Schwarzenegger administration.
At this point, I think the notion that Schwarzenegger is going to show great largesse to conservatives post-election is naive. If he doesn't need to make conservative politcy concessions to gain enough conservative support to win the election, he certainly doesn't need to make conservative appointments afterward.
I'm sympathetic to the argument that Bustamante must be defeated. But that's not the same as arguing that Arnold is a conservative, or that he intends to help the conservative movement.