OK, I have been up the garage loft.... this is what I have found....
sorry, no Dura-Ace complete downtube levers... I do have the levers where the friction part is broken / removed. If you have 105/600 levers perhaps you could recreate?
I have a RH Shimano 600 (6400R) complete working lever and I can probably create a matching LH one from spares.
I have 2 x 7402 rear mechs, one in average condition ... possibly non-original lower pulley and looks like a worn upper pulley
(£35), one in excellent with both original pulley wheels (£55)
7410 crankset with original titanium bolts. 172.5 cranks. 41/53 chainrings. Outer is original, inner is stronglight (but appears as original), both excellent. slight scratching on crankarms. (£70)
7403 front mech. Looks excellent however one of the adjuster screw threads is stripped. (£20)
7402 calipers - immaculate and original. Still have Dura-ace shoes, pads and the extremely rare rubber plugs in the centre. No rust on any parts.
Difficult to judge how to price.... just seen a pair for €142euros on eBay but I think he's dreaming. I guess £60 is more than realistic in this condition (and I'll happily keep them anyway)