This may be the dumb question of the day. I have been raising asphalt for 15 years and looking to get in to dirt racing. I'm looking at buying A B mod. My question is what are the main differences between an IMCA northern sport mod and a Wissota Midwest mod? Can you run one or the other at any track? Or are they easily convertible to run at the opposing tracks? If so what would you have to change to run a sport mod at a Wissota track or what would you need to change on a mid West mod to run at an IMCA track?Any help would be appreciated?