That's probably a 216 in that truck. You have some options for registering a truck like that you want to use. You can register with "truck" plates and pay by the weight you register at or if you can get farm ID and farm plates and the weight registration cost goes way down. Either way you're insurance will be high. Or you can register as a normal vehicle which is legal because I'm sure that truck doesn't weigh over 8000 lbs. This way you can get antique auto insurance. I would weigh the truck and find out how much weight you can haul without paying for the high weight registration. Check the ODOT website for a reg cost list.