thanks for your input...
in the meanwhile i looked out for a new cam, as the original one shows dezent wear on 2 lobes...
(but i cld. not see or feel any wear on the corresponding lifters - guess i will put in new ones to be sure everything is fine)
a motorshop (which does mostly Mopar-Engines) here in Germany offered me a set of new Hughes 1102 valvesprings - and a used roller cam (specs. unknown but they assume lift would be arround 450-460 and duration should be 260 .. unfort. there is no grind number on the cam) which they allready have on the shelf... the cam will cost me 100 Euros shipped to my door (approx 105 USD)