A bunch of the 70s British gear that I've seen naked has %2 metal film (4 band color code with a RED tolerance band) which I'm assuming are probably +/-100ppm or worse. I take this as justification to use a lot of modern metal film resistors with the same specs in the gear I build. The Dale CCF07 series, for example. Mouser sells them really cheap. I think they're made with basically the same composition as they were two or three decades ago.
To answer the question, %2 should be fine for most, if not all, of the support circuitry. If you're wiring up stereo pairs and want them to be identical then I would use %1 resistors for the input pad (or anything else pretaining to balanced input) sensitivty switches, the feedback network, and parts of the discrete amp sections. If you don't care about .25dB-.5dB of error here and there then just use %2 (or even %5) throughout. One thing to keep in mind is the lower the resistor value, the more of an effect that tolerance is going to have.
Above all, just make sure your phantom power application resistors are 0.1% (buy precision or get a meter good enough to measure from a batch of %1) for good common mode rejection.