You could let the motor lean, if anything it helps reach the upper bolts of the bellhousing, if your mounts are old though I recommend just using something tied to the motor and the front radiator support to keep it in it's original position so you don't tear them any worse. You can do it with 2 jack stands just jack her up high that way you can reach the driveshaft bolts too. The bellhousings are the same so no worries there and it's fine if you use a used block plate as long as it's in ok shape, but make sure yours is broken because to remove it you have to take off the clutch and flywheel. Just take your time, overall it's not a terribly hard job to do honestly, when your taking the tranny off take off the t5 from the bellhousing, than the bellhousing itself. Do the same when you're installing it, as you put the tranny in sometimes it'll go almost all the way in and won't seat with like 1/2 an inch to go. Instead of fighting with it or worse just torqueing the bolts down to get it to seat up against the bellhousing, hook up the clutch cable and have someone push in the clutch for you and it'll pop right in. Hope this helps and let us know how it goes.