Joe,
Just a thought! Maybe you should contact Randy Thompson of Thompson Air, Anderson, California. Randy seems highly regarded on the Cessna 120/140 forum, and is one of the frequent participants and advisors. He specializes in 4-Cylinder continentals, and holds the STC for the O-200 installation in 140's. He advertises on eBay frequently, and right now that is the only way I've found to communicate with him, unless someone knows his number or e-mail address. I've seen him advertise overhauled O-200's exchange for half what you stated your bill will be!
Here is his current ad, #
4609743173 [
cgi.ebay.com]
