Sometimes I want to have a high-level conversation with a high-deviation-score kind of person.
Literal
Sometimes deviation-score [genitive-の] high person [with-と] level [genitive-の] high conversation do-try-want.
偏差値 ('deviation value, deviation score') is a huge cultural concept in Japan — the statistical metric used to rank students' academic performance relative to peers. Used colloquially to mean 'intellectually able, academically successful.' The whole sentence is a classic self-improvement wish: a yearning to engage with smarter people. ~してみたい combines ~てみる ('try') with ~たい ('want to').