If you shim the bushing correctly it wont be tight. The kit comes with several shims in different thicknesses.
Its very simple really.
http://www.cva.com/CVA-Store-View.php?id=504
The purpose of the Shim Kit is ONLY to bring your firing pin retainer flush with the frame
Contrary to the next line in the description, it will help with blowby if your bushing is recessed in the frame.