Complaints about the new one: engine is undersized, hood and cowl corners have too tight a radius making them too square.
Old one: tires and wheels all same size, hood side panels are not flared out enough (should flow straight into headlight pods on grille shell).
If I were to combine the two, I'd probably take the old body and engine, new chassis, decals, and tires, and look for better wheels elsewhere. Just an opinion, though, and you know what they say about opinions...
--Mark