That's a good question. I don't think I've ever heard it asked. I've never seen a 2.3L in Trophy Stock and the rules only address the 5.0L and 4.6L blocks. You could definitely run in the bracket classes or even raise the question to George Klass to see if it has ever been considered.
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Jeff Chambers
T/S #4
12.53 Seconds/109.3 MPH
http://www.kellnet.com/chambers/default.htm