Hi Eric, how are you doing? I've missed the Explorer X guys, that fell off several years ago.
If you are serious about the LS to swap in a 2nd gen, I can point you to a man who just finished swapping one in place of a 302, in his 80's Volvo. He's very nice, helpful, and smart enough to get it done himself. He is on the Corral a lot documenting his Volvo project, in the "East Tennnesee" thread. It's very long and his posts have been the central subject for a long time. His name is Michael Yount, he's in NC I think.
He can tell you well how wide the LS is versus the 302, specifically the critical part, the exhaust. He has an aftermarket SS log manifold on his LS, it's very compact and has 1.75" primaries in it. I bet that would fit, and he reworked the front accessories to fit his Volvo better. There are multiple layouts for the accessories of the LS models.