I'm no fitting expert...
But top tube length is very important.
Depending on the style of the frame- bikes with the same length seat tube might fit differently.
Most current bikes are more compact than older models, so the maker and time period usually contributes to the way the bike will fit.
What I would suggest would be to go back to the shop, express your possible interest in the bike and see if they'll hook it up on a trainer for you. See if someone knowledgable will help you determine a proper seat position. From there- find out where your bars need to be for your riding style.
This should get you closer to determining if this frame is a good size for you.