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I'm getting ready to Installing my heads. But I'm a little confuse on torque sequence and 90° angle, cam someone explain?
From Head Torque and Sequence!!! - Hemi Truck Club :

Tighten the cylinder head bolts in three steps using the sequence provided :
Step 1— Snug tighten M12 cylinder head bolts, in sequence, to 34 N·m (25 ft. lbs.) and M8 bolts to 20 N·m (15 ft. lbs.) torque.
Step 2— Tighten M12 cylinder head bolts, in sequence, to 54 N·m (40 ft. lbs.) and verify M8 bolts to 20 N·m (15 ft. lbs.) torque..
Step 3— Turn M12 cylinder head bolts, in sequence, 90 degrees and tighten M8 bolts to 34 N·m (25 ft. lbs.) torque.

90 degrees is in reference to 1/4 turn where a full turn would be 360 degrees.
 
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