It's likely an emissions thing. If you need an extra bung somewhere an exhaust shop should be able to make a hole and weld one in. Same for moving a bung.
I have 90-95 3.0 V6 headers on my 86.5 with a 3.3L V6. The difference for me was the emissions bungs. Also my Y pipe wasn't wide enough but not something you have to worry about with the KA.
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1986.5 SE-V6 4X4 D21 Hardbody
Pacesetter Long Tube Headers
Morimoto Mini D2S HID Projectors and Hella 500s
VG33i

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