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It would be a big help if you knew the actual guide no of your old flashgun. If you do a Google search on the brand/model, you may get lucky and find some specs for it.
Is there going to be any street or other ambient lighting? If you shoot RAW you'll be surprised what you can get away with and how much exposure latitude it gives you, and you may get a better looking result without flash. I took some available light night shots recently at 800 ISO. They were on the noisy side but a run through Noiseware made them perfectly acceptable.
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