High resolution IR overtone pumping with an injection seeded optical parametric oscillator (OPO) is used in conjunction with excimer laser photolysis to investigate the state-resolved dynamics of quantum state-selected van der Waals clusters in a slit supersonic expansion. The narrow band IR light source (160 MHz, 5 mJ) preselects a specific upper state via the internal rotor band of Ar-H2O which correlates to the 03](-)<--00](+),0(00)<--1(01) transition in H2O monomer. At fixed UV photolysis and probe wavelength, scanning the high resolution OPO yields the 03](-)<--00](+),Sigma(0(00))<--Sigma(1(01)) overtone action spectrum of Ar-H2O complexes. Conversely, at fixed IR pump wavelength, the state distribution of the OH photoproduct from photolysis of quantum state selected Ar-H2O clusters can be probed by laser induced fluorescence on the A (2) Sigma(+)<--X(2)II(0,0) band. The OH distributions from H2O monomer vs Ar-H2O photolysis from the same internal rotor state are remarkably similar, though significant anomalies are observed for specific K rotational levels.