Just cut off the heads of the cross bolts and use a dab of JB Weld to glue them on the side of block. It'll look just the same and it's way cheaper. 550 horsepower will never even get used on the street. You can't even use 400 horses on the street. Even with the best rubber your tires are just going to spin, spin, spin anytime you get on the throttle. If it really is destined to be a street car, and you're not going for wheelies on drag slicks, just go with the glue.
