Hi, i need your help regarding this matter. Im thinking of upgrading my bike which is a 2005 Screaming Eagle Electra Glide which has the 103" engine to the 124" MONSTER BIG BORE KIT HARLEY, i just need to know.... do i need to change the heads. this kit is by REVOLUTION PERFORMANCE and im just not clear about the heads. All thats mentioned is that i got to bore the case. Thank you.