I have a 73 catalina. 400. The drivers side exhaust manifold has been missing both the front and rear fasteners for what looks like years ( not broken in heads just gone) it has developed quite the exhaust leak from manifolds warping. The passenger side is also missing the front bolt but it's not as bad. I though this would be a perfect time to install headers. The previous owner had new exhaust installed from the manifolds back. My issue is, while I know there are dozens of options for headers on a 400. None that I can find specifically say they will fit a Catalina. I was wondering if anyone had any input. Thanks.