Welcome Big Red! I read your intro. thread as well. Glad to see you are wanting to improve your health with your food intake and exercise.
So what weight are you looking to get to? At 6'0 167 your BMI is 22.6, which is considered a healthy weight, although I am not always a big fan of BMI because larger muscle mass people can throw it off. I like to look at body fat percentages as well. As you say, your body fat level seems to be fine.
Since you are not exactly sure how many calories you are taking in a day now, you might want to go to www.myfitnesspal.com
and start keeping a log of what foods you take in. This site makes it easy to keep up with your calories, fat, protein and carb intake levels.
Once you get an idea of your average intake in a day currently,(i would say after a log of 5 days you should have a general idea) that will give you a better idea of what you need to increase your calorie intake to in the future to get to whatever weight you want.