Jim pretty much spelled it out. It depends on wht you intend it use it for. If you're really gonna just race it the 460 is hard to argue against. But if you intend to run on the street 600-800 horsepower is overkill. That kind of power gives you 2 speeds stop and OH MY GODDDDDD!
The windsor has good potential, with all the stroker kits. That and you can run EFI, basically anything that can be bolted up to a 5.0. But I hope you have the $$$. Nothing that you have now in the car will work with the windsor. You'll have to supply the engine, accessories, intake, and tranny.
I had a 351c-2v. Went out and got closed chamber 4v heads, had them machined to run adjustable rockers, and it screams!! forget the 2v Aussie heads they have no top end. Put port plates on the intake side of the 4v heads and that will help the intake charge velocity, and thus your low RPM performance, while not chokeing off your top end.
It's easy to make Horsepower! You just have to figure out what you want to use it for, and how much $$$$$ you want to spend! Good luck!
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