Valve string with 150Kmi on them. Change or not to change?

[Konstantin Bogach]

I am rebuilding 10V head (stock cam) with 150 Kmi on it.  Is there 
pronounced common wisdom on changing valve springs on high milage cars?

Thank you very much.
Konstantin.
200tqa '89 (under reconstruction)
200tq '89
S4 '93