We installed GooSync client in Classic following the standard installation procedure (.prc file can be downloaded from GooSync account). After installation and setting GooSync username and password, it is ready to roll.
Through GooSync, you can choose to sync your Google account Contacts and Calendar items with your Contacts and Calendar in Classic. Tasks however can be synced with tasks in GooSync only.
So, GooSync works with Classic. And we have to say it works like a charm.