The 83 and the 87 make spark in the same way. Identical circuits. The difference lies in the fuel system and how the fuel computer gets the spark info. In LH2.2 cars, there's an extra pin on the V/C ignition module to bring the spark timing to the fuel CU. This can be a fooler, because it requires the junction of the two harnesses (ign and fuel) under the manifold. The spark timing is on a gray wire; and an orange wire joins the TPS switch to both CU's.

But you have everything 83 now, 'cept the motor itself, right? Should be just a matter of getting it spliced back into the car's wiring under the dash (since you had it out), I'd think. You'll have to get spark first before you worry about whether the fuel ECU sees it. In LH2.0, that's a gray shielded (coaxial) wire.

Temp sensors are identical 83 and 87 - blue.
--
Art Benstein near Baltimore

Those who get too big for their britches will be exposed in the end.