What do you think its worth before the swap compared to after the swap?
To be honest if it's as clean underneath as it is above I'd take my chances on a bring a trailer submission.
Before the swap every guy wanting a clean sleeper to drop a Pontiac v8 or big block is interested. After an ls swap you need someone who wants an ls swap because they're a PITA to undo, wiring gets hacked in the process, etc etc. And for original cars on BAT the money is flowing right now.
And I think you'll find a smaller nunber of wagon loving ls swap buyers than wagon loving big block or poncho v8 buyers.
If you want to ls swap it to enjoy that's one thing. But you're not going to swing a profit by adding an ls swap to the car. Any buyer at that point will want one well sorted using professional grade parts, not home brew work, which will cost much more than any value added.