So I had a general question. I bought a 1968 Firebird Convertible this year and it was sold to me by a private seller as a numbers matching 350 car. but once I was able to find and clean the block the engine is not numbers matching. it is a Pontiac 350 with the YN stamp which I think came out of a 1968 tempest from the research I did. Does this effect the value of the car? and if so what would the difference be between the 2 if in same condition as far as value and is there anything that can be done in regards to the seller that sold me the car?