You may need a shim under the starter. That should cure the drag problem.
Is this the Performer from the trash pile? That may answer some questions on that. If not, you may need to fatten up your jetting a bit, at idle, a 427 is going to take a bit more fuel than the 350 did. You won't notice a big problem with the 600 until upper RPM's, which is not a TD427 strong area anyway. For grunt and low RPM power, the 600 will be fine.
Timing, you should be somewhere from 6-10*, that will be a trial and error thing, but should be pretty close.
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