Hi Daz ,I run a good few classic springers and I try and use scopes from those periods which are kassner apollo jap glass tasco and nikko stirlings, bentlys , fontaine and optima's most of these are low mag ideally x4-6 mag, I do have some variables mags fitted too but not really needed, the thing I love about these makes and models is they all ( I think) had Japanese glass with really sharp optics and the optima's and some fontaine scopes have bullet drop compensator cams (BDC) fitted to them of which work well. They should not cost you a fortune either if you look around, good luck.
Atb Doug,