1991 3F installing in a FJ40, Replacing a 1F with a 3F

[Deuce Cleaver]

I have a 3f pulled out of a 1991 for an LS swap......I'd like to use it in a FJ40 bulid.......
Can a 1F bell housing, mainfolds, etc bolt on a 3F? Can you use a manual fuel pump on a 3F? What differences will be challenging and is it doable. Thanks in advance for all the insite.

 

[Malleus]

Just swap the head. Much simpler.