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50 (US) mpg sounds very ambitious but there's no harm in trying.
It might be possible, subject to valve lift conflicts with that required for 800HP, to add in AFM from a later LS. The ability to switch to a 2.4l engine would reduce some of the pumping loss at low engine power requirement.
Likewise, it may be possible to use the variable cam timing from a later version of this engine.
Without having to respect emission requirements lean burn will help. You could also implement EGR. They won't be additive but could be complementary.
BMW had an engine series a few decades ago - ETA - that were optimised for fuel efficiency. Designed for low rpm operation with light valve spring pressures etc. Might find some ideas there.
A compression ratio optimised for E85 will help but there are diminishing returns. Once you get past about 10:1 the thermal efficiency gains really start to level out with further increase. Past 13:1 it's pretty flat. That you are using pressure charging will tend to push the CR in the wrong direction and probably less than 10:1. How effectively can you intercool it?
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