16V 4AGE can make similar to blacktop power with a compression bump, mild to moderate cams, and a bit of careful headwork.
For evidence - http://www.toymods.org.au/forums/thr...=1#post1090620
Can you acquire a spare engine to work from? This may provide you a bit of extra time allowing you to baby the current lump, and not take it apart, but replace it once the spare has been overhauled.
Back to the thought of a swap... how electrically talented are you? Besides worrying about the possible need to rebuild a 20V, you will also need to merge the 2 wiring harnesses. Doing wiring is my downfall.... so I'd choose adding something to your 16V and keep stock management
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