Same here, I have collector plates in my Mach, good for 50 years I believe. I have the registration that came with the plates, but the DMV should be able to run you off a set if you've lost yours.
From what I saw last year, when it got to the end of the tech line, it was VERY late in the day. It took a loooooooong time to get all the cars through (I hope they have more/better lines this year). By the end of the day, they were just shoving cars through and doing minimal checks, like dates on belts, jackets and helmets. They were just trying to get finished! So if all else fails, wait till the end, there's a good chance they'll just push you through..lol Do you have a roll bar in the truck?