It's gonna be a pain in the butt to get the input shaft of the trans to line up either way, if you plan to leave the trans in the truck during the swap. It's do-able, but will require some wrestling. That being said, and in reference to your other post about leaving the hood on, leave the bellhousing bolted to the trans. You know about the balance, so the only other slight obstacle will be the driver side motor mount bracket. The ears on the 360 block will be narrower than the 318, so just mount the bracket to the 360 the same way it was on the 318....and stack flat washers in the small gap between the ears and the mount. In my experience swapping motors in my old 84 D350, leave a motor mount bracket loose on one side so the stud on the bottom of the rubber mount will go thru the frame easier. If you tighten them both up to the block, one will go in and the other won't. Good luck with it....and don't hurt your sore foot!