Personally, I can`t think of any good reason to consider the 84 5.0 combination, the NHRA HP rating is the same, but the 85 has a larger hyd. roller cam. Now, if the 83-84 engines were rated at the factory 175 HP rating, I would think that the 418/444" hyd. flat tappet cam would be a better choice, but at 208HP, I gotta say the 85 makes the most sense. If you need any E5 head castings, let me know, I`ve got a few extra sets.
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