In the interest of full disclosure, I don't care much for the raisiny flavors that come from Special B, which is probably why I'd shy so strongly away from it. That said, it would still be out of place in a RedHook clone. I'd stick with the C90 and omit the extra C60, myself. If you're concerned about color, you could try steeping a very small amount of a darker malt, but flavorwise I think you'd be better off not doing so.
I assume this is an extract batch? If it's AG, you might have a few more options. That said, going with C90 will probably get you closest without tweaking things too much.