I am rebuilding my 650 with an MRRPM 860 BBK with maverick heads and MRRPM performance cams. I will soon be starting the rebuild and am studying my service manual and in the section for heads it says the cams are different and not to interchange them between #1 & #2 cylinder heads? Maybe this is just for OEM cams? Any truth to this? If so how will I know which cam is for which head since the new cams were just shipped in packing along with the BBK?