Trim the outer fat to 1/2 inch and if possible, marinate the roast in the refrigerator with 2 cups of the BBQ sauce for 8-12 hours. Lift from sauce and pat fry with paper towell. Roast in 325 degree oven 30 minutes per pound. Brush often with BBQ sauce during the last 1/2 hour of cooking.
Seperate large lean muscles from one another by making cuts at natural divisions. Cut each large muscle across the grain into think slices.