Fuel filler neck will need to be changed to handle extra distance.
Radiator shroud will need to be lowered to stay centered on the fan.
Pay attention to your clutch/throttle linkage.. as well as shifter linkage.
Pay attention to your brake Master Cyl lines that go to the frame.. the distance will change there too.
Make sure your steering shaft has a rag joint.. loosen the steering wheel or just remove it so the shaft can drop down some, then reattach.
Once done, look close for all the wires to make sure nothing is too short or rubbing.
Getting the old mounts off is tough if they are old.. you will likely use a sawzall (spray wd40 on the blade while cutting) to cut most off... or a torch to burn them out.. I prefer cutting them.
Good luck