Jhaa-lives is right on the money, how much do you want to spend??? You can build a or buy a good small block for what you about to spend on the inline. A 302 would be a easyer bolt in then the 292 will be. The later 250 292 is a total different engine and will require different crossmembers and engine supports. The shorter stroke 250 will rev higher and quicker then the 292, but the bigger cubic engine will all ways make more power. Read the book Leo wrote and study it close, pay real close attention to the rpm range and peak hp rpm, they are extremely high for everyday driving, 6000 plus rpm!

With all that said, you probably new it any way, the inline is a cool way to go fast! A turbo 292 will make killer torque. Joe