Is there a "pure" conservative candidate to be found? I do not believe there is and I don't know of anyone demanding one. However, a history of consistent conservative values are definitely a big plus. As for Trump - it would help if his knee-jerk responses didn't tend to align with his center-to-far-left "NYC-Values" that he was raised with. And those "NYC-values" should surprise no one -- it's all he's ever known. The better question is, "why would you think someone who has consistently displayed those "NYC-Values" is *suddenly* a conservative?"
Bear in mind, with trump's history...
