1Do this the day before tailgating
Pat roast dry with paper towels. Using fork, prick roast about 20 times on each side. Combine garlic, oil, and salt and rub over roast. Cover with plastic wrap and refrigerate for 1 hour or up to 24 hours.
Soak wood chips in bowl of water to cover for 15 minutes.
Open bottom vents on grill.
Light large chimney starter filled with charcoal briquettes (about 100 coals) and burn until charcoal is covered with fine gray ash.
Pour hot coals in even layer over one half of grill. Set cooking grate in place, cover, open lid vents completely, and let grill heat for 5 minutes. Scrape cooking grate clean.
Using paper towels, wipe garlic paste off roast.
Rub pepper and garlic salt all over meat.
Grill directly over coals until well browned, about 5 minutes per side.
Carefully remove roast and cooking grate from grill and scatter wood chips over coals.
Replace cooking grate and arrange roast on cooler side of grill.
Cover, positioning lid vents directly over meat, and cook until roast registers about 130 degrees (for medium-rare), about 20 minutes. This can be done at game or at home the day before.
Slice thin and fill warmed corn or flour tortillas add your own salsa and any other condiments