It makes sense to use the harness that is already in place. I am in the process of getting another harness right now.
Would you recommend keeping the port injection, or would it be more simple to go TBI? My existing injectors are already in pretty sad shape, so I would probably have to replace them anyway. I was leaning towards doing a throttle body on the '87 first, learing a little more about the MS system, and then tackling the '88, probably would transplant the 2.6 into the '87 since my '88 is a pile of rust, and the '87 is fairly rust free. Would you recommend that, or should I just go whole hog on the 2.6 from the get go? I am not too good with electronics, so I figured going simple first would be a good learning tool for me. On the MPI, is it possible to use the dizzy for position only, and then run multiple coils for the spark? How many coils can the MS controller handle? I think I read only one, but I am not familiar with the add-ons you mentioned, and perhaps they allow for control of more coils. I will have to do some more reading on the MS boards to learn a little more.
I think you are right about the 2.6 distributor. From what I can tell, two wires are for power, and one is position signal, and the other is the injector signal. I am not familiar with the newer GM distributors, are they also an encoder type set-up? Maybe a 2.3 dizzy could be used in the 2.6? Maybe a spring or weight change may be needed to get the advance curve right? I am just thinking out loud here, so please bear with me.
Thanks
Kris