A couple of options;
- Full EFI conversion on the 87; this is what you have described and is a good way to go, but can get quite involved with the wiring and fuel system issues.

- Convert the 86 22RE to a 22R; this option involves using the 22RE longblock and bolting up the 22R manifold and carb. Pretty much a simple bolt in process, no wiring changes. You will need to add the mechanical fuel pump to the 22RE block, take the fuel pump and eccentric drive from the end of the cam off the old 22R.

Personally I have take the second approach until I decide if I want to do the full on EFI conversion and collect all the parts, the carb works fine for my current applications. Good luck.