Engine and gear, Chevy Impala 1958 , please help me guys, I need your help.

It all depends on what your wanting to do with it, but you can get a decent small block v8 from jegs/summit for around $3500 transmission runs a little cheaper, bout $3000 and rear end wise probably looking at anywhere from $2500-3000. These are just approx prices, can always be more or could be less. Really all depends on what your plans are for it.

Thanks a lot, actually as I said, I need engine and gear that last for long time, I know that it depends on what I want, that's why I asked just to get a good engine and gear parts that would be reasonable to buy. Thanks again my friend, add any idea or information that would be helpful.

No problem, glad I could help.