SamZ, do you realize how much power you're going to get out a naturally aspirated big block?? I dont know what you're building, but if you go with the 496, you'll have more torque than you know what to do with. Most guys have trouble hooking up a well built 496 WITHOUT a blower! My god, you'll never be able to get all that power to the ground! Good suggestion on the books, read up a lot on big blocks.... And this one, Big-Block Chevy Performance - by Dave Emanuel , has a section on blowers...just the book you need. John