need a source for valve springs for Schrick 272

[Konstantine Bogach]

The guy who rebuilding the head from my 200tq '89 said that if I put
Schrick cam then I have to put appropriate valve springs.  Is it true
that stock springs will not suffice? Where can I get those springs?  I
found 1 source in archives (from 1998) - techtonics.  I will try to call
tomorrow but if you know other sources I would appreciate if let me
know.

Thank you.

Konstantin Bogach.