No cutoff date..And yes they have a separate mustang class..Reg fee 20.00. Spectator fee 3.00 BaddMojo going to enter his ride in this one...I may go to this one..only 5min away for me.. Show is 9am to 4pm... also a swap meet/car corral... GET OFF EXIT 19 ON THE NORTHWAY TAKE A LEFT...OVER BRIDGE SCHOOL IS ON THE RIGHT...