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@bangtango
Not sure if it's of any use now, but check the front mech bracket - they only had about 10mm of vertical adjustment for the front mech (seperate plate welded to seat tube)
I had a Cro-Mega DX frame years ago when 52t was considered 'ok' for D/H chainrings and the front mech only just cleared the rings.
You might have to go 'old school' with your cranks!