Integral Valve Guide (Broken Boss) Repair Options

prh gives the proper fix
couple of things
new guides will not be concentric with the stock ones so bvvc
what kind of shape are the guides in?
do you need new guides anyway?
you could do what the porters do and cut the guides down
and put in inserts if you need guides
does it need ex seats
valves sunk?
magnum heads crack check

lots of conflicting advice you have to sort it out
are these heads worth putting money in for the long term or for long enough to get better heads
if so just clean up and run it