No doubt it can be done if the only rules are "SB" and "inline wedge head" and "NA". No doubt it would be an R&D exercise but it could be done. (the op didn't say anything about wedge heads only so that is a rule that you made up Monte)

The Pro Stock truck guys were 950 hp from 358 cubes a few years back and the Aussie Pro Stock guys are 1100 hp from 400 cubes. I've seen dyno sheets from 900 hp SB motors which seem believeable and there are turn key sprint car engines which are in the neighborhood of the number. So when you add those data points up it looks like an achieveable number to me.