Mancini Motor Mount Conversion

Any issues with the thickness on the sets you have used Professor?
Nope.
Having never used the Mancini mounts, all I can say is that both sets are designed to use the rubber mounts that they come with- the metal brackets may differ slightly from each other to accommodate the thickness of the rubber biscuit that they come with.
That said, any swap mount kit may require some finessing to fit variations in your particular build- shimming the mounts for header/column clearance, etc. Nothing major usually. One thing I did change on the last one I did was to use a mid '80s truck isolator on the driver's side- it has interlocking fingers on it to keep it from tearing apart, so I didn't need to find room to fit a torque strap. The thickness is close enough to work with.
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It looks like the Mancini brackets use a thicker (early A style) isolator, so the same thing might be accomplished with them by using a thicker '90ish diesel mount.