Possible outcomes (fold = +$0) if we call are
split pot +$135
catch bluff +$685
lose -$424
if we assume 5% bluff, 30% nuts, 60% Qx we make 34.25 - 127.2 + 101.25 = +$8.3
never bluffs, 20% nuts = -$29
If we think UCS never bluffs, this is a fold. If he ever bluffs, it's a call.