Junked 68 valiat

I'll have to agree with some of the above. If you wait for the slant 6 to die before replacing it... good luck. That may never happen If you take care of it.
As for the V8 k-member, find a newer one that accepts spool type motor mounts and front stabilizer bar (73 up). A 68 model V8 K-member dont seem worth the effort to me.