In general, you'd expect to gain weight. The height of a person is not an indicator of caloric needs. However, a person's activity level impacts caloric requirements. If an individual is very active, he/she will need more calories to support the activities and to maintain weight.
On the other hand, one must take into consideration an individual's metabolic rate. If your rate of metabolism can support the additional calories, you may not gain weight. But, since caloric intake and expenditure must be equal to maintain weight, taking in more calories than you can use WILL result in weight gain.
