Motor mounts. 360 going where a 318 was. M Mounts the same?

Dust me once said

Stuffing a 1978 ish 360 where a 318 was in my 1970 duster. Are motor mounts the same? I did a brief search on site here but did not come up with anything. Thanks in advance.

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Pishta hit it on the nose, so yes, you can use the 318 mount if you wish
This is one that someone spaced with a too small piece, but you get the idea.
The washers is what I used and I believe it's more sturdy than this little spacer.

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