It's been a while since I've rebuilt an engine but you can get the dizzy 180degrees out sometimes, have you physically checked cylinder no1 is at the top while the rotor arm pointing at the connection that runs to plug no.1?
I swapped my leads the other day and had a fail moment, I thought the rotor arm rotated clockwise instead of anticlockwise (as you look at it). It was only after I took the cap off to check and cranked it I noticed, haha.