I completely agree with nitrosportsandunerunner. But be sure to only use blue thread lock on those motor mount screws because if you use the red you will strip the head the next time you need to remove the screws and that's no fun.
When you set your gear mesh for the first time use very thin paper between the gears when you are installing the engine. Paper like receipt paper works well. Set the gears tight then after everything is installed turn your gears and roll out the paper and your mesh should be spot on.
Also you can order a whole trans mission and drop it in it costs a little more but its a whole lot easier than taking the transmission apart plus you have the old trans for parts if you have other troubles. The P/N for the whole trans is 06034 I think its only like $22.00.