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@muleboy
whether modern or vintage, the axle taper/type will be the same on either bottom brackets. To my knowledge veloce bottom brackets come in a 111mm or 115.5mm axle lengths. From the number '68-SS-120' i am assuming that your current bottom bracket is a 120mm which i've never come across before.
Your best bet is to measure the bottom bracket axle length and get one that is the same length. If the current bottom bracket you have is now the original length that the bike came with, then that bottom bracket might not necessarily be the best bottom bracket for your chainset/chainline. Bottom bracket lengths can be a bit of a trial and error game i find. good luck!