There are many variables incuding camshaft selection, headers, is it carbureted or fuel injected? Turbo (s)? Nitrous? Etc., etc. Normally a good rule of thumb for a mild rebuild with 4 barrel and headers is approximately .75 to 1.25 horsepower per cubic inch.
Example:
302ci @ .030 over is 306ci.
306ci x .75hp = 229.5hp
306ci x 1.25hp=383hp
With an average 306hp It will move out pretty quick in a light car like a Mustang.
These are just averages and could range greatly one way or the other depending on how radical or mild you decide to build it. With a single turbo and some good tuning 475-500hp isn't out of the question. At that point you will want to seriously consider strengthening the bottom end with a forged crank. I could ramble but it will get edited out anyway Good Luck with the build!
As much as your wallet can afford.
That depends on the components used. It can vary from around 150 to over 1000.
The bore adds about 10 cu. inches to make it a 337
its called nothing because you wouldn't have a ENGINE left if you bored it 4" over
A 289 bored .030 over.
A 262 bored 30 over.
A 427 bored .60 over is 438.8572417 or basically a 439.
That would be called a Chevy 307 bored .40 over.
332
332
355
A 350 bored 40 over is a automobile engine which has had its displacement increased to 383 cubic inches. This results in more power without needing to purchase a new engine.