maybe check for engine mounts.
I have a 97 Mercury Villager it also behave the same, there is a modest (not severe) vibration at idle in Drive. Once i put it in "N", the problem is not that prominant. But when i shift from "N" to "D", there is slight clinking noise. I think it's coming from the engine mounts.
Btw why did you replace head gasket? you losing coolant or something?
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