Colnago Dream B Stay sizing question

Can anyone help?
The lack of these available to try anywhere near me (plus their age, so rarity) means I'm in a not sure dilemma.
I am 5'11" with about a 32.5" inside leg. I have found a really nice Colnago Dream B Stay for sale with a 58cm c-c downtube and a 56cm top tube. I'm pretty certain it's going to be too big for me (ill be able to ride it, but will it be comfortable) but are there any owners or knowledge out there that might be able to advise me?
Thanks.
The lack of these available to try anywhere near me (plus their age, so rarity) means I'm in a not sure dilemma.
I am 5'11" with about a 32.5" inside leg. I have found a really nice Colnago Dream B Stay for sale with a 58cm c-c downtube and a 56cm top tube. I'm pretty certain it's going to be too big for me (ill be able to ride it, but will it be comfortable) but are there any owners or knowledge out there that might be able to advise me?
Thanks.
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Posts
Colnago measure seat tube from centre BB to "top" meaning bottom of seat collar. I am 5'10" and ride a 54cm traditional geometry (horizontal top tube) Colnago. At 6" you would probably fit a 56cm.
I think you'd be ok with anywhere from a 56 to a 58 (horizontal measurements, subtract 4 for sloping) depending on how you like the bike to look - how much exposed seatpost and stem length.
What is your current BB to saddle top in centimeters? (I think inches was phased out in 1842!)
There are some Colnago specialists who recommend you actually pick a frame a tiny bit small, so you can run a longer stem and a bit of setback on the saddle.They reckon the geometry works best for handling in that set up. Whether it's rubbish or not, dunno...
I guess I keep looking. Colnago ownership has to happen for me at least once and I quite fancy and older style frame.