I have a 1980, 1000, Ironhead, Sportster , that I'm tearing down. While it's apart, I would like to have the heads madified , for dual spark plug operations. However I have been unable to find a shop that does this kind of work, a lot of them say they CAN modify my heads, but none have ever done this work before. I need a reasonable rate shop , with experiance. If you know of some one please email me.