I have a winchester model 70 30-06 springfield SN#296903. i was wondering when it was made and how much worth?

You might try asking a firearms dealer. They usually have books that list manufacture date, ociated serial numbers with the date of manufacture, and any characteristics that make the gun unique. If it is a pre-1964 Winchester, it is very valuable if in good condition. The rarest model 70 is chambered in .358 Winchester. They are easily worth $2000