I have been searching and I cant find my engine block vin. The pad in front of the passenger and its blank. I searched all over the block and all I can find is a metal tag stamp to the block that reads "Remanufactured 668002" I was told the truck had a 350 when I got it but the Vin on the dash says its a 305. How can I tell without taking the engine apart to measure the cylinders ports.