ORIGINAL: DaveSR71
Brian Hampton from Adelaide(downunder) has good knowledge of the Enya.
Tell him I sent you!
I'll help if I can but I'm not sure what the question is

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You mentioned a 29-IIIB Super Typhoon though which has me wondering. The Typhoon name was only applicable to the very first sand cast Enyas with a red cylinder head from the early 50's but there was an Enya 29-IIIB Special called the Speedy in the USA which had a bathtub shaped intake and a single rear ballrace amongst other differences.