my friend used a fluidyne designed for a 94/95 in his 84. the main difference is that the fill spout on the 94/95 radiator was much taller. It "almost" didn't clear the hood, but it did,...just barely. That's about all I can offer, it's a a starting point, or maybe worth a try.
I would not do it - it is a step down. I am lookin at swappin a fox radiator into my SN, and here is what I think I have figured out.
The SN rad is an alum one row. it is tiny to fit in the tiny SN snout. it appears to have different inlet and outlet sizes (for the rad hoses) than a fox radiator (I was gonna see if I could shoehorn a 3 core HD fox radiator in my SN - the stock rad is not cutting it).
But a stock fox radiator should cool better than a comparable SN rad - I really would stick with the fox rad.