Vin trouble

Hello vets I'm new here. I recently purchased a supposed 76 roadrunner but it has a Dodge Aspen Hood, 7 1/4 rear end, and the vin comes back as 1968 Plymouth volare... At this point I think I'll have to register it as a custom vehicle with all the mix matched parts. Any help truly identifying this vehicle would be greatly appreciated, thanks in advance
Does the vin on the title match the vin on the dash?