This happened to me recently lifter failed >ate came>engine gone ,new l98 =3300$ with 60000kms replace the broken engine.
The old engine i am rebuilding , as hardly no metal through out engine. how ever the cost would of still been 3k for parts ,cam ,lifters, blah blah ,
but 7k sounds way to high.
get it checked out if it's (just a cam) that may not be so bad ( maybe time to upgrade ? new cam?