I wasn't sure about the numbers between the Valkyrie and the Wing, and it seems pretty obvious that you've done lots and lots of research but I figured I'd better throw it out there just in case. If memory serves it seems like the Valk had different cams to get the different rev profile. I also remember reading that Honda managed to get it though DOT inspections w/ straight through exhaust pipes, maybe there's a difference there as well. Didn't mean to throw a wrench into the works... carry on.I really debated using a Valkyrie motor but it doesn't have reverse and hp and torque are essentially the same although the Valkyrie revs higher. Looked in to swapping to Valkyrie carbs but not really viable. Here is a mock up scaled rear section and a pic with me to show the size of i