Bent Frame, bent k member

Bear in mind you don't HAVE to use a 68 K. Now, you do want to stick with a V8 K unless you want to do a bunch of fabrication to adapt V8 motor mount perches, or spend more money for "swap" mounts. However, since your 68 K "seems" to be junk, it's conceivable to use those motor mount perches and convert a /6 K to V8

67 had an oddball idler arm, but if your K is "junk" you could run across a 67 K and weld your 68 idler arm perches to the 67 K

Otherwise, with "same" motor mounts, you can use 68-72 V8, or the noted 67 by fabbing idler arm perch

You could also use 73/ and later V8, but you'd need to change to the later "spool" motor mounts. Some think those are better, and some do not.