I think you're kidding but just in case you're not, I've seen 4 other Legacys with domestic swaps. Mine, a 4th gen in the Middle East, a second gen with a carbureted 350 and a forum member with an iron block LS swap now in progress.
Besides Legacys, I've also seen a WRX drift car with an LS, two WRX street cars with LS swaps and a BRZ with an LS.
OP, congrats on all your hard work and seeing it through til completion!