Hi,
I think I'd call up the racing publisher and tell them the truth. Basicall I'd write a letter to the publisher and expose the person, and eventually humiliate him/her/them, and then ask the publisher to mention me as the builder.
If all else fails, then I'd grab a baseball bat and head down to where the owner is with his car/engine. I'd then beat the crap outta the liar, and then the car/engine. Naw, j/k.
Bye!
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Gautam N. Lad
http://www.cubicdesign.com
http://www.cubicdesign.com/mustang/