In general, based on what you are reporting I would expect mostly fat gain given the loads lifted in relation to your BMI at the time. Just think about it, a 275 lb deadlift at 200 lb is not remotely heavy. So I suspect that the weight gain was probably too rapid and your calories were likely not balanced properly. Common error people make on this program. In general, you need to do the following:
1) Start the program with the deadlift way ahead of your squat and ramp it up faster than your squat.
2) Deadlift 3 times per week until you can't
3) Keep your carbohydrates and protein high and keep your fats moderate.
Rinse, lather, repeat. If you need more specific advice I'm available for consults and/or long-term coaching.