The vin on the radiator core support only has 6 numbers, is this normal?

I don't know exactly how many but they are known to be a partial VIN. Both numbers should match each other and match the VIN. The officials should know that. This is not the first day there's been a Mopar through your inspections

Also, after '68 there should be a partial VIN down on the engine pan rail, assuming it is the original engine.