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Current wheels are for 5/6/7-speed, not 8. The cassette wheel is a 126mm spaced Uniglide hub with a 7-speed Hyperglide freehub, which fits 9 of the 10 gears off a 10-speed Hyperglide cassette. I have the 10-speed Dura Ace downtube shifters and just use 9 of the clicks. It's all a straight swap to get more gears in a narrow frame. To take all 10 gears it just needs the wider freehub body and a longer axle.
The HED is a screw-on freewheel so that can't be modified, and I'm pretty sure it's only wide enough on that side for the 7-speed freewheel or it'll hit the stays.
Jonny69
if 8 fit, 10 should too.. only obscure early 7400 dura ace had a proprietary 8sp system, the rest is ≤7; 8-10 (1mm spacer for 10); 11≤
(if i'm not mistaken)