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You might find the answer here:-
http://www.sheldonbrown.com/dura-ace.html
Looks like it may work with the alternative cable routing: http://www.sheldonbrown.com/dura-ace.html#alternate
Greenbank
Can I use my Shimano SL-7402 downtube shifters with newer 8 speed Shimano derailleurs, or is the cable pull different?