Indy Cylinder Head Show, Indianapolis, IN. March 7th and 8th
The swap meet is good, but I do not know if it would be good enough to drive 700 plus miles one way for the event. For us, it is 508 miles one way, but as being a vendor, it is a very good show for us.
Unless you purchase a Friday pass, the swap meet is basically a one day event. Friday is set up day for everyone and there is a fair bit of activities going on for those searching out the deals. Saturday from the opening of the doors to approximately 1:30 PM is booming. By 3:00 PM, some of the smaller vendors will be already packing up their items and starting to carry their product to the side doors to load up and head home. Sunday is very slow as it is mostly the larger vendors and swappers who have to wait to get inside to load up.
You will see a couple of swappers who attend this event and that does not hit Carlisle or The Nats. Like any event, you never know what and who may show up.
Hope that this might give you some more insight.