For what it's worth, I'd like to see it done. Not that I'd ever do it to mine, as it's a "daily driver"...

I've been in situations before where I was in 4hi with the ac going and the pedal to the floor and just simply didn't have the power to climb up a steep hill after I had stopped for a sec. Flipping the AC off gave me just that little bit that got me going

If I ever thought about doing modifications that hefty, I'd probably just try and squeeze in a v8 to get that hearty low end torque. I don't need high revs unless it's for engine compression braking.