A term common in the legal community is "dicta", meaning something repeated so often as "true", accepted as such. I've personally had no occasion for first hand experience. That said, the lack of an enlarged "Standard Model" pre '64 barrel sight-boss accommodation in the Featherweight, would put you one obstacle deleted. Yet still, too many other factors suggesting 'high odds' against 'reasonable' adaptation. One approach, perhaps 'buy & try'. IF the pre 64 stock original, in good condition and reasonably purchased; an investment & if swap failed, marketability shouldn't be a problem. Short of that, just to wish you luck in connecting with someone able to offer a definitive response. Most, as me, likely falling back upon "dicta"!
I do wish the best in finding your answers!
Stay Safe!!
John
Postscript: Getting curious concerning action hole spacing and o/a action lengths... started Googling. You might check out a number of Gun Website Threads within this listing:
https://www.google.com/search?q=win...178j0j0&sourceid=chrome&ie=UTF-8
