Depends where you are. There are still many Datsun Sunny 5 speeds available in NZ. If you want to spend a little you can also get a conversion kit for a Toyota 5 speed. Another option
would be dropping a taller diff in - depends what you use the vehicle for as to whether you want to sacrifice quickness for lower revs. Of course if you're running the A14 at 200k's
then it's always gonna rev hard no matter what!