Fiamme would be easier to find I guess, Mavic sprints form that period seem VERY few and far between. There is quite a few 26 1/4 Dunlop Light Alloy (Dunlop LA) rims for sale on ebay at the moment, these are nice clincher rims and ride well from what I remember (I had some on the EF Russ that I had a few years back), so you could build (or get built) some wheels up. This would be my choice I think. Apparently they are hard to get a tyres on but I can't remember if I found this the case or not.
Fiamme would be easier to find I guess, Mavic sprints form that period seem VERY few and far between. There is quite a few 26 1/4 Dunlop Light Alloy (Dunlop LA) rims for sale on ebay at the moment, these are nice clincher rims and ride well from what I remember (I had some on the EF Russ that I had a few years back), so you could build (or get built) some wheels up. This would be my choice I think. Apparently they are hard to get a tyres on but I can't remember if I found this the case or not.