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I've never reused head gaskets before, this is new to me. I can see reusing them on the same block with the same heads etc., But reusing them with a totaly different head is spooky.



That was my thought when I went to new heads on my current motor. I didn't want to take the risk of them leaking with different heads so I just bought new ones. But, I kept the old ones just in case I ever get brave and decide to re-use them at some point.
If it were me, I would buy new ones rather than risk them leaking once they are in the car.