FYI - Fj60 2F air cleaner doesn't work with '78 2F valve cover. Height is wrong unless using a 60 series carb and the bolt placement for the air cleaner is different. Would need to swap to a late 40 series or 60 series v/c.
I have a '78 air cleaner if you're still looking. $100 + ride.
Matt and all,you should post photos of your 1978 air box , this way we all can learn the physical visual differences ?