I recently purchased a Harley Davidson that has been custom built. It is titled as a 1975 softail custom and is supposed to have all 2000 wide glide parts on a softail frame. The frame # starts with 9D and I am told this is a builders number. I also have the serial # for the motor. The motor appears to be a twin 88. Can anyone tell me how I can find out exactly what year and model the motor is and exactly what year make and type frame I have?