I think you may be off a tooth......
Find the compression stroke on number 1, by having someone bump the starter, with your finger over hole of cyl #1(spark plug removed)......when you start to feel compression, stop bumping the starter, you know you are on the compression stroke, and the mark on the pulley should be close to zero on the timing mark.....now manually rotate the engine so the mark is on zero(should not be far away).......mark the side of the distributor, where the #1 terminal is on the cap.....remove cap......does that mark line up exactly with the tip of the rotor? If it doesn't, you are off a tooth or two.....