The Hellcrate is still a little more expensive than a 700 hp big block but it isn't a lot more. A 700 hp big block using a factory block and all new parts is usually in the $15,000 range. A Hellcrate is probably close to $20K by the time you buy the front end kit and the install kit plus the various swap parts. A Hellcrate should be more streetable than the average 700 hp big block. Typically a big block will need a roller cam to get into the 700 hp range so then you have some wear issues and a bronze gear and stuff like that. You can build a fairly streetable 700 hp big block with EFI and the correct cam choice but the cost goes up. If you are going to drive the car a lot then the Hellcrate is probably the best choice, especially if you go with the matching transmission.