Honda Civic engines from the late 80s and early 90s might also fit the bill if you're looking for light dependable cheap engines that make about 100 HP. The D16A6 in my 1990 CRX Si was rated at 108 HP stock, and I think 99 lb-ft of torque? The gearing is way too low for good economy, but the motor is decently thrifty.
And the CRX HF ran a D15B6 (?) good for ~65 HP, and with tall gears it was a serious fuel sipper.
-soD
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