"Re-phrasing further, what spend would be required to make a 347 safe at 7000, and a 445W safe at 6500?"
The same parts that would make a 289/302 safe at 7000.
Just because it's a shorter stroke, like a factory 289 or 302, it doesn't mean that it will automatically live endlessly at 7000 rpm. I wouldn't build a 302 to make power at those rpm levels without a quality aftermarket crank, rods, light forged pistons, shaft mounted rockers (or at least stud rockers with a girdle), etc, etc. The 445W automatically gets most of those parts as the SVO blocks use the 2.750" forged crankshafts, aftermarket rods, etc.
But there again, we're losing sight of the original agenda....a 7000 rpm engine doesn't match to a 3.07 rearend gear in a street car.
