While on the subject of Gardners, here is an excellent Blog about rebuilding a 6LXB - ok, not an 8L3B, but still a wonderful engine.
And an excellent Blog as well.
Mr. Geeeeeeeeeeeeee is in the House! https://mobius.world/mr-geeeeeeeeeeeeee-is-in-the-house/
And for high latitudes exploration, they do seem to be ideal - David Cowper's Polar Bound has an 8LXB.
Gardner + Aluminium = Goldilocks eXtreme eXploration Passage Maker https://mobius.world/gardner-aluminium-goldilocks-exreme-exploration-passage-maker/
I have been on Polar Bound and met David. Great boat and a brilliant skipper!