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Have you considered motorcycle engines?
If that's not where you want to go, maybe GMs Ecotec line. I believe any Ecotec engine will mate up to the RWD trannies in the Solstice/Sky and this would give a wide range of sizes/performance to choose from.
Look to small pickups? 4cyl out of an S10, Ranger, Tacoma, etc. Very common and inexpensive.
Nissan 240SX motor?
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