You can make it through the regular number. Depending on the restaurant, you could be told that your party will be split in two (probably two tables of four). It just depnds on if the restaurant has tables for larger parties or not. However, don't let that be a problem. Your reservation will be linked in the system so your tables will probably (more than probably - likely, more than likely - really really likely) be right next to each other and they can push them together.