Classical trajectory calculations are performed for the Penning ionization system He*(2 S-3) + N-2 --> He(1 S-1) + N-2(+)((X) over tilde (2)Sigma(g)(+), (A) over tilde (2)Pi(u), (B) over tilde (2)Sigma(u)(+)) + e(-). Anisotropic model potentials of He*(2 S-3) + N-2 are adapted to reproduce collision- energy dependence of ionic-state-resolved ionization cross sections observed by two-dimensional Penning ionization electron spectroscopy. Results of trajectory calculations are compared with those of ab initio potential surfaces obtained by Ishida. Opacity functions are demonstrated to be strongly dependent on ionic states, collision energy, and anisotropic varieties of trajectories.