Narcissistic Personality Disorder is not what he has, but narcissism is a quality he does posses. (Think Donald Trump) While he is totally full of himself, it's not the primary diagnosis.
He has a delusional disorder (I am Joan of Arc, I am here to save you!) and is characterized by a set of false beliefs. It is a higher functioning of the psychosis. It stems from low ego strength and a need for acceptance and attention. His dogmatic and narcissistic qualities prevent him from staying grounded in reality. He has such fanciful dreams of the 60s and 70s that he has convinced himself he was there and somehow instrumental in all things Ford racing related. Of course he affords many accolades to others (who are dead and cant vouch) or others he wont name, and others who dont have a presence on the forum to vouch for him. This gives him space to live out his fantasy. But us *** holes are the ones spoiling it for him. Like someone in a hallucinogenic haze, he really doesnt want to touch base with reality.
And the more that the mods and others facilitate this fantasy, it just empowers him more to perpetuate it.