lon,
Well, there's only one answer to the displacement question: 468 cubic inches. The stock bore is 4.360 so 0.040 overbore gives 4.400; the stock stroke is 3.850 so you can easily verify my arithmetic.
The other half of your question has no precise answer because there are too many variables such as what original engine you began with, compression ratio and any other non-stock mods you may incorporate in the process of putting the engine back together.
Stock 460s came in a variety of horsepower ratings. Here's a sample of what I mean quoting from a web site at
Engine Specs, Engine Information, Firing Order, Horsepower Specs : Engine Facts.com
Quote:
1968-1972 Ford 460 with 4 Barrel Carb
Max Brake Horsepower - 365 @ 4400 rpm
Max Torque – 388 @ 2800 rpm
Stroke - 3.85
Bore – 4.36
1973-1996 Ford 460 with 4 Barrel Carb
Both horsepower and torque for the 460 from 1973 until 1996 changed many times depending on emission controls, various fuel injection and carburetor setups as well as what the engine was used in. For the most part, the max horsepower stayed between 205 and 275 hp for any factory built motor with max torque ratings between usually being between 345 and 375 lbs.
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You see what I mean: max hp varied from 205 to 365 depending on the year and what vehicle it was installed in. There are differences in head configuration, whether it is/was a smog motor etc etc.
Suffice it to say that with a mild hydraulic cam and very little other mods it could easily prove adequate to propel a kit Cobra for quite a few thousand trouble-free and smile-filled miles
Tom