Spin2,

Joe Wagner has the engines column in AMA's Model Aviation mag. You may find an email address there, or a snail-mail address, to contact him.

He also published as plans for direct sale - no magazine tie-in - for a "Super Chief" which may or may not be acceptable at a given OTS contest. (Thicker wing, blunter LE, etc., and asserted references that such a Chief was flown "in the day.")

Luck!