Cost for rebuild

[Joker2]

I was wondering if anyone knows about how much it would cost to have my engine tore down to determine a chatter I have had in my engine ( sounds like a lifter tap on a car ) Engine was only rebuilt three seasons ago, I suspect that my VRO was not supplying proper oil for two seasons, finally removed it and this year was mixing manually but I still hear a tapping, especially loud betwen 3,000- 4,000 RPM's, motor runs great though. Trying to determine if I should just keep using it or have it taken apart and fixed ( Money is an issue ). The motor is a 1994 150 Evinrude Ocean Pro 60 degree looper. I am on Long Island in NY. Th x.