This is a common problem with old brittle chain guides and chain wear. You will have to remove the head, replace the bent valves, put in Helicoils or Timeserts into the head bolt holes.

You can also find a replacement engine.

Where are you located?

__________________
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.