If you can do the work yourself, it's not too costly to replace the guides and the chain. If the engine still has the single row chain, there are several sprockets to replace to upgrade it to a duplex chain. The real problem is that the driver side inside chain guide breaks causing the chain to slip a tooth or two and then the valves crash into the pistons. So proper maintenance is required.

I added a post on how I replaced my guides and then the chain on my 420SEL.

If you can't do the work yourself, it may not be worth it.

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.