4x4 floor hump

[kidatheart]

I am getting ready to put a 79 2 wheel drive cab on an 84 4x4 frame. I was gutting the 84 cab last night, pulled the carpet out, and was very surprised the find the high hump was formed into the floor-clear back under the seat. When did they start doing that? I was expecting a bolt-in hump that I could install in the 79 cab, after cutting the floor in the 79 cab. The frame has a 700r4 and a np207(I think that's what it's called). If I find a bolt in high hump out of and older square body, will that give me enough clearance? I have all of the tools and knowledge to cut the floor out of the 84 cab and put it in the 79-just not what I really wanted to do. Any suggestions? Thank you.