Tom,
I'm in the same situation as you but it's due to a cracked case on my rear engine. It has a non VAR crank as well. My options are limited so I'm purchasing a Factory New IO-360-CB engine. It has a great warranty and has a 1700 TBO. My front engine is healthy make no metal and only has 300ish hours since overhaul. What engine models does the F337G have? Don Nieser in Oklahoma City may have some healthy used engines for you. He specializes in Skymaster parts. His company is Commodore Aerospace Corp. 405-503-4686
Hope the helps,
Andrew
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