No need to swap 87 knuckles on. Read this.:
http://www.dempseybowling.com/shelby/slhpkgs.htm
The only daytona knuckles you swap on is when you go to 11" vented 4 wheel disc. and those are 89+ The SLH1 is what you want which is 14" caravan adapter brakets and calipers from 85-89 ish. And the larger MC. 220mm rear drums work, or 89+ 10" rear solid rotors would be ok too with the caravan fronts. If you go vented rears you MUST go 11" fronts. Other wise you stick with the 10.6" stuff.