2001 Expedition Front Timing Chain Noise

Could really use some help from the group with this one. 5.4L engine
with P&I heads, 110K miles but well maintained every 3000 with
synthetic oil. Loud rattle from the front of the engine. Two Ford
dealerships are suggesting front timing chain(s?), however both suggest
engine swap. It seems both shops have limited experience doing the
chain repair. Said this problem is pretty rare.

Has anyone else seen this problem with this engine? Any suggestions?
The repair is $1700 and the swap is $5700. No guarantee on the repair.
Its my daughter's truck and in this shape I'm afraid she owes more
than it might be worth.

Thanks in advance. - JimC