I'm having about the same luck with parts lately. What I've discovered is if it has the word hemi in the description...it's going to be on backorder. I thought that when the crate motor got here that all I had to do was order up a few parts and put my chal convert back together. It's not so easy. My TTI headers have been order for over 9 weeks and they're still not here. Something about problems with their guys that do the ceramic coating or some b.s. Year One has backordered almost every part that I've ordered. They can't even get me a simple radiator. I've gotten so tired of trying to put that car back together that I ordered a shaker hood setup for my 71 cuda just to have something to do.
Good luck getting that car together. At least a Mopar's worth waiting for.