What type of school is he interested in, and what is he considering as a major? It doesn’t make sense to look at a school for an admissions boost if they don’t offer the major he wants, or if it’s not the type of school that he wants to attend.
My initial thought went to Pitt, Penn State, and Ohio State as large public universities. These schools have very low Hispanic student populations (due in large part to the relatively low Hispanic populations in the region), so I would expect him to get a boost there compared to states such as TX, FL, or CA. His grades put him as a match with these schools anyway, so I don’t know if there would be an actual boost. However, I do believe that they offer diversity scholarships that he could potentially qualify for.