Aircraft engines where banned from NHRA Competition in 1963. They ran exhibition until they where deemed to unsafe or where deemed to be taking the thunder away from the fuel cars due to the fact that they ran much faster at certain tracks.
Other sanctioning bodies allowed them, AHRA, IHRA and NASCAR, until they too deemed them unsafe for competition,but allowed them for exhibition. Independent tracks allowed them since they where not sanctioned and wanted to put on a show!
Have fun!