small block 671 blower ?
Here is the story on the Modman. You can redrill the holes that attach it to the intake to move it forward a bit. The other thing you can do is cut the back of the plate so it is even with back of the intake. After that you have to install a blowoff valve in the side of the intake. After all that it works perfect. You may also have to grind a little off of the back plate of the blower for a little extra clearance.
Jack