Update. Called Sacramento Vintage Ford today to see about the backordered plates. After a long discussion I was told the manufacturer of the boxing plates lost the engineered specs to cut new rear boxing plates. At this news I decided to get the front set that they were keeping for me in will call and have them mail them to me so that I can at least get the engine back in this summer.. After talking to the guy in the warehouse, he tracked down my will-call parts, and found a box of rear boxing plates right next to them. So looks like I lucked out, some times it pays to keep pestering people. They mailed them out today, so hopefully I'll get them by this weekend. These have been holding up everything, so it's a relief to know they're almost here! I had been searching the net for rear plates for over a month with no luck!