[blykins]

How many bearings spun? What were the rod clearances?

Too much fuel over a very long period of time will cause damage....but not of that kind....the gasoline will actually etch the bearings and rings...but I don't think it would cause them to spin in the bores.

470hp? Sounds kinda optimistic. Did it run on pump gas?

To answer your question, I would stroke it...Of course you will need a new crank, rods, and pistons if you do so. How far? Depends what you're wanting. There's no substitute for cubes....but with the bore constraints of a Windsor block, it's generally the longer the stroke the more torque you're gonna get....and at a lower rpm. The shorter the stroke, less torque, but more horsepower....and at a higher rpm.