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I wouldn't plan a 4.5 stroke in a 440 block for anything beyond about 600 hp, and then only if I had a very light rotating assembly and / or a center weighted crank to help relieve stress on the bottom end combined with small port heads....
At that point, why bother with the long stroke if you're not going after a big HP number? Get a Megablock or other aftermarket block, let it eat, and sleep soundly.
The reasons are budget, what's on hand and the torque range desired.
Well, of course, Greg. But, having a limited budget doesn't trump common sense, and most of all, safety. Like Monte said, you'll never know when the bomb will go off, and if it lets go at the top end, the resulting damage will be a lot more than what an aftermarket block costs.
Gone to the dark side with an LS3 powered '57 Chevy 210
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