Info "loss" on early computer controlled carb vehicles.

Fixing on my 1987 caravan carb 2.2L and found very little info (1) on google and even almost nothing from couple local chrysler dealers. Been on and off digging for info on these Chrysler computer modules for 2.2L 4 cyl carb engines that was used on many vehicles from 1981 to mid 1987. After that, 2.2 and 2.5 got TBI. But there was eariler 2.2 with turbo that used computer but completely another topic for another time and others has covered this in detail. Goes like this: What spark control computer (module) especially for van and truck were set up by part number. Remember keep in mind far as I can gather, K cars and most sedans etc got seperate computer modules (Computer inside interior of vehicle and power module in the engine bay.) Dakota did get 2.2 carb also along with older caravans of this period. What particular computer is used with what particular emissions system (so far three types: Calif, Federal and Canadian, some didn't get air pump for catylast converter, some either got non-feedback carbs some got feedback carb (uses a O2 sensor). Which means more different computers too. And by year. Etc. Remember that computer & carb era in late 1980's is becoming of age for "restorations" or saving that info before this completely disappears into mists of time. My 'van 1987 which means is 17 years, soon 18 years which is really LONG time ago. I see a parallel to your people's researches into classic computers with very little info but yet for some reason are successful. What's the trick to that efforts to dig the last 95% that I already found on other 5%? Typically would be found in the service manuals but this is not true because I did have the manuals for my 'van, again little info. Cheers, Wizard (1) Found many good info websites but the last 95% isn't there.