Need help with a conveyor script [?]

I have this conveyor script, it works until there is a hill, then the blocks stop in front of it, no errors, just want to know how I could make this one go up instead of forward.

while true do
script.Parent.Velocity = script.Parent.CFrame.lookVector*-1000
wait(0.2)
end

If you mean to move players or blocks, you don't need to script! Just make sure the block is selected and go to properties and look for** VELOCITY**. Y would make it up, X will make it left and right and Z is forward and back. In those directions, it will move the player there! No need to script for it! Try it!