Phil,
A general note.
I think it would be unwise not to pull the head. Regardless of engine speed, when a chain breaks the cam(s) stop moving while the pistons do not. When this happens you can be sure, some parts are going to touch to some degree.

I tried the approach that because the car was just idling into a parking spot, there probably wasn't alot of damage, and I could just change the chain and sproket. It just doesn't happen. I even managed to get the engine restarted (not well) with severely bent pushrods and 4 bent valves.

Bite the bullet and either pull it all apart or drop in an engine like Aaron is offering. You could spend that money many times over trying to do the least amount of repair.

My $0.02. ($0.0315 canadian)

Mark