Wait a cotton picken minute! A 231 is a Buick V6 which I believe uses different mounts than the Chevy 229/200 V6s. My understanding is that the 4.3 is almost identical to the 229/200 externally and can use the same mounts.
Which year of 4.3 are you considering swapping in?
The Buick 3.8 was installed in A/G bodies in California. And of course in upper division cars. The mounts might need to be moved to different holes in the frame.
Otherwise, the 4.3L mounts should be indentical to the 229/200 mounts. So no problems there.
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