Before broiling, remove the garlic from both the chicken and marinade.
Arrange the chicken halves, end to end on the grate, directly under the broiler. Broil for 15 minutes, basting with marinade every 5 minutes and rotating the halves 180 degrees after the first 10 minutes. Turn the chicken halves over and broil for another 15-20 minutes, basting and rotating as before. Turn chicken for the final time. Season with salt and pepper. Broil until the skin just bubbles. Remove from oven and allow to rest for 8 minutes.