It all depends on if you plan a hardcore restoration or not. Simply switching and intake and carb, IMO, won't ruin the car, but by all means save every old part. I would not switch engines, just to do it. I don't think that there are many differences between the 82 and 84 engines, other than the 4 bbl. If your 82 engine is original to the car, your vin should be stamped in the block. You have a nice and very rare car, so be cautious as to what you change.
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