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You can use your existing crankset with a 39 tooth front chainring, and a 7 speed rear freewheel from Dura Ace which might give you a largest rear cog of 28. This, paired with a new SRAM PC-870 chain should give you more range.
Other than my fixed gear bike, and my modern road bike, most of my riding over the years has been on Campagnolo C Record gear, so it's been a challenge to get much of gear range when limited by the short cage rear derailleur.
Lot's of good advice offered already, so hope this adds to it! If you need a smaller chainring send me a PM, might have an extra.
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