First time seeing this thread... glad you rediscovered your Raleigh. Don't be intimidated by the mileage for the tour. As long as you just ride at a comfortable pace
for you, the miles will fall behind you and you'll find 60 isn't nearly as big as it sounds in your head right now.
(Days two and three may be unpleasant.
)
And yeah, you already know this, but
nice bike!
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera