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Sorry but you are entirely wrong.
@EricMitjans The fork will have to go but your headtube can stay.
The fork has to go as ahead forks are not made with the any regard to the internal diameter of the steerer as threaded forks are. Even if you are lucky enough to possess a set of forks with the requisite ID to the steerer, chances are cutting a thread into this steerer may destroy it, get something made for the job.
Your forks could be swapped for an 1 1/8" threaded fork, 1 1/8" threaded headset and 1 1/8" quill stem or 1" quill stem and a 1" - 1 1/8" shim.
But, ignoring the mechanical inefficiencies of a threaded headset and quill stem there are a few problems with the above solution solution -
1 1/8" threaded forks are not entirely uncommon but decent road/track forks with a 1 1/8" threaded steerer are. Most 1 1/8" threaded forks will be pretty low quality, aimed at the very bottom of the market, BSOs from supermarkets etc.
1 1/8" threaded headsets are not entirely uncommon but decent ones....you get the picture.
1 1/8" quill stems are not entirely uncommon but...see where this is going?
The shim is a bit of a bodge and where steering is concerned, you don't want to be bodging.
A much more reliable solution would be to fit a set of 1 1/8" - 1" headtube reducers, a 1" threaded headset, a 1" threaded fork and the 1" quill stem but that's a lot of shit to find, buy and fit all in order to run a more complex headset, a less stiff stem and an older fork.
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M_V
No, you can't run a quill stem on a threadless frame unless you replace the fork and head tube. You'll have to buy a 1 1/8 stem, which, luckily will work far better and aren't as retrogrouch.
If you want the aesthetic of a quill, and I don't know why you would then the closest would be something like a Nitto CT-80, which are kinda pricey. Alternatively Velo orange make the 'Tall Stack Stem'
which might do what you want, is less pricey, uglier, and available from Freshtripe
http://www.freshtripe.co.uk/freshtripe/Handlebars,%20Headsets%20%26%20Stems.html