Pat, that could be a hard question to answer. GM made some changes to that engine in about 85. Most notable was the change from a two-piece rear main seal to a one-piece. This came about as the result of a change in the diameter of the main bearings. One book I have also states a difference in the weight of a front-drive bare block versus a rear-drive bare block, with the front drive being lighter. Makes me think they machined off a little extra weight someplace. Might have been just for clearance or maybe it was something that would only be needed in rear-drive configuration. Only sure way to tell would be side by side comparison.
Something else to consider is that this vehicle will have to pass a smog check. I doubt that the cam used for the FI version will be the same as the one for a carb. Could cause some problems come smog check time, especially since those 2.8 carb motors had enough issues passing smog in the first place.
Have you considered a GM reman long block? If you start running into parts interchange issues with the Cimarron engine, you might be time and money ahead just buying a direct replacement.