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don't bother with LS6
LS6 is just an LS1 with bigger cooling lines in the head, different cams and different tuning. Buying a late model LS1 (2000 or newer) will actually have the same heads at the LS6... the LS1 is about half the price of an LS6 and you have to retune the computer to use in the S chassis anyway.
not to mention the LS6 uses a drive by wire on the throttle which is an enormous headache to adapt to a cable system.
As for the NA SR... IIRC it has LESS power than the KA... honestly if you're all about mileage look into changing your rear end gears you'll get more mileage for your $$ there then with an engine swap. the reason the LSx motors get such great mileage has little to do with their design and everything to do with the fact that they make good torque and they're geared well 6th gear on the T-56 transmission is pretty much just for fuel economy and you can bog around at 1200RPMs all the time. I wouldn't be surprised if an NA SR got worse economy than the KA.
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