Need Help....k-frame

hey guys its me. me and my dad are putting together a '68 Barracuda and the guy who had the car before us didnt know what he was doing and i guess he welded the engine to the engine mount and K-Frame so the K-Frame is ruined and im in dire need for another one...im guessing my dad wants to put a 440 in it but im thinking of keeping the 318 in it any suggestions for a K-Frame let me know please thanks bye.