I think Al Silvera, a.k.a. Alsil, is still selling his crossmember for the Ford convertion. Check the member list and drop him an e-mail. Also, Jon Miwa, a.k.a. Jumbo240zz has a 302 in his Z. And Jon is not too far away from you , Antioch. Plus Jon just loves working on other peoples Z cars. Just ask Alex. He'll probably just run right up there and help you put it in.
Seriously, 300 clams is a great deal if it runs well and only has 42k on the clock. Are you sure that's not 142k, or 242k?