When to freshen engine

How often do you all freshen youre engines? I bought a bracket car recently with 380 runs on the engine. It's a stock steel crank 440 with BME rods, JE pistons. Shifts @ 5,800 and traps around 6,100 in a 2,400 lb. car. The oil pressure is 90psi cold and 85 psi warmed up. I'm thinking, if a oil analysis comes back clean I'll run it until I start seeing the oil pressure drop and have the oil analyzed twice a year. Opinions ?
Thansk in advance.