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I believe the theory was not to run with exposed exhaust ports very long as they would cool too quickly and potentially warp being exposed to the atmosphere when shut off. Having at least the headers hooked up allow more heat to be retained in the system allowing for a progressive cooling.
I don't recall how long I ran it... probably not long as she was still on the lift.
I've since sold her but last word was she was still chugging along approaching 200K. I said I rebuilt it... that was the plan but after full inspection all that was truly needed were cam followers and seals/gaskets. Crosshatching still looked fresh at 175K. Amazing.