Sure you weren't 180 out? Many times I've rebuilt engines and the lines aren't dead nuts, but a tooth one way or the other makes it far worse.
180 out won't bend the valves but 170 or 190 might...... That would be 180 and a couple teeth off.
Double check your manual.
I believe the 350X has to have the "O" at 12 0-clock and the lines should be fairly parallel to the head surface with both cam lobes facing down.
Also make sure your looking at "T" and not "F"; And take the plug out so crank rotation isn't so erratic.........
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country