The combunstion chamber in the SEMI-Hemi isn't really good for Nitrous too much quench area, and can cause detonation problems. The other problem is for the Big Nitrous engines is that the engine is heavy. He's working on a wedge head right now with the 5.30" Bore center that should be a pretty good deal on Nitrous.
3 Tenths is about what you'll get going to a Nitrous engine from a killer P/S engine. We can run mid 20's with a P/S engine, and we can do mid 90's with the Nitrous stuff. Both legal, so light weight you're looking at high 80's on a Nitrous car, and high teens for a P/S in killer air. Now go to the big engine, which knowing where the power curve is on it we should be OK :drool5: