When I set all mine up.. I put the carb base level, That will have the trans down 3*, Then I set the pinion 3* up..
Now if it's for the track, I will set the pinion level.. When setting it up this way, Sometimes it will look funny and you will think something isn't right,, But it work's.. Good luck..
And as far as the side to side.. Some cars came with the drive shaft off center..