Although the article does not mention it, it will be necessary to heat and bend the tab on the motor mount to allow space for the hardened rod. And the .030" clearance figure is very nominal.
The real advantage of this setup is that we have the positive retaining of the engine under full load, but it does not transfer the roughness and noise into the cabin as does any kind of solid mount. That is not a problem with a race car, but is quite important with a quiet muffled car that will be driven on the street. I tried solid straps, chains, and cables before Joe came up with this idea. And the original mount has now been in service for about 13 years and thousands of dragstrip runs.
Jim Hand
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