Well, I'll say that there's a member of this forum who is always willing to pay generous cash promptly for rare CPU upgrades
I won't say who it is, but you can get in touch with them easily by clicking the "private message" button under my name
In any case-great find and enjoy it whether you decide to keep it or pass it on!
One last thing-as far as installing Leopard...I've been struggling with it for a while now on a Lombard with a G4. It's not a straight forward install. Pismos are easy, but that's because they are(in a round-a-bout way) a portable Sawtooth and with a G4 card Leopard is plug and play. I can't find any record of anyone successfully installing Leopard on a Lombard. I imagine a Wallstreet would be even worse.