I have been offered a pair of hand built Mavic Open pro 32hole clinchers with campagnolo hubs and the older 8 speed cassette in good working order for my pair of NOS fiamme tubulars and the old Campy high flange hubs laced to pretty cruddy fiammes...

I already have a set of NOS high flange hubs so I'm not at a loss the only catch is I have to drive about 2 hours. Is the old campy 8 speed cassette stuff going to be like working on dinosaur?

i wouldn't do it... I just spent time this evening unlacing some cruddy fiammes from some cruddy record high flange hubs. I intend to try and resurrect them with a polishing wheel and polishing compound. ANd you have both these things NOS!