http://www.scriptspot.com/3ds-max/scripts/3-point-align You select 3 points on your object (vertices) and 3 points on another object, could be a plane with edges that corespond to y axis of the world, and this script will align the first object rotation wise so that it matches the direction of those points.
@hiredblade - I tried it, but it changes the volume of the object. @respawnrt - I tried the script and this one http://www.youtube.com/watch?v=qpErfW3fUtE, close but seems like it's not totally parallel, there's seems to be a very very small difference. Thank you for the reply guys. I think I'll just remodel the object in…