just download some maps from honda-tech- i'm sure there's a 310cc map already out there, or do as vteckidd posted (i attached a obd1 gsr map)
get some chips from Fry's electronics or Radioshack, burn one using youtube method, pop it into the socket on your socketed ECU = done
You can have a baseline semi reliable chip, and then one to experiment on while datalogging. Unless you're beating on the car all day, it doesn't have to be perfect.