...and a blown LSX can be built to do 2,000 hp.

...but that's not the point here, is it?

How about a blown 350 SBC? You can make one that'll put out 1,500 hp.

Maybe a 2JZ? http://www.topgear.com/uk/car-news/modified-toyota-supra-drag-racing-record-2014-10-23

But at that point we're probably well beyond the means (or aspirations) of 99% of us.