1.'Somebody told you your Headbolt Receiver Holes are "Buggered"?
First I'd get an Expert, Unbiased (No Pony In this Race) Opinion.
2. I'd use "Timeserts" over Helicoils.
(Single piece insert,not a floppy coil.'Much Stronger.)
http://www.timesert.com/
http://www.timesert.com/html/mtrcsert.html
http://www.timesert.com/html/usefultools.html
[Hell, I'm "Risk Challenged",I'd do the Timeserts myself,IF Necessary.]