Front frame rails?

Having been there done that.....I'd recommend you take a very close look at the torsion bar crossmember where the anchors are welded. These things rust from the inside out and there is a very good possibility that is ready to go too.

I bought a complete southern front clip that was cut through the rockers behind the t-bar crossmember and through the a-pillars just above the cowl. It included the inner fenders, radiator area and the firewall. I didn't use the firewall.