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Sounds like you have the B16's tranny. To be clear, you want to run a B16 block with an LS (b18a/b) head? I don't think you'll have the clearance, it won't work.
The B16 is a hell of a motor but as others have said, it's not an economical one. It develops torque way too high in the RPM range and has a short stroke, better to get a new B18B block, or the whole motor. You can probably find one for less than $500 with low miles.
I run a B18B with the B16 tranny and I've been averaging about 34mpg since it warmed up, your car is lighter and more aerodynamic so you can probably do a little better.
I'd rather have the B18B tranny too, though.
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