I've not been intimate with any of the newer Ford pushrod engines, but I have developed aftermarket products for both the GM LS engines and the late model Dodge Hemi engines. Been pretty intimate with both. And while I'm not much of a Dodge fan, but I gotta say, the Hemi sure strikes me as a much better built engine that the LS. It's such a cleaner, simpler design from top to bottom.
So to me, I get that the reason to go LS is "because everyone else does it", but if I chose a V8 swap powerplant for reasons other than that it would not be an LS.
If I was gonna swap a GM powerplant in an 80 series I'd choose the 4.2 Atlas over an LS. What a superbly underrated little beast those buggers are!