exhaust manifold stud replacement

["Colin Barfoot" <Colin_Barfoot@msn.com>]

The repair for my circumferentially cracked turbo exhaust to downpipe weld was 
started last night that looks like it will be ok.
When checking the exhaust manifold studs re the exhaust leak there I found 
fully 7 studs were sheared off. (New record perhaps?)
So as recommended by this list the intake manifold, turbo,wastegate etc will 
come off to see if the studs can be drilled in situ or else the head will come 
off.
Those who have drilled in situ (dremel tool I remember) are there any special 
thinks to be careful of?
It was suggested that I machine the manifold for flatness, any specs? or other 
work do do while machining?!...
If I have to remove the head is there any special R&R I should do while it is 
off? Is there anything I should check on the turbo etc.  The car has 305,000 
km, (I know, I know, still low mileage).
One good think is this will be the ideal time to install my new TAP samco hose 
and turbo blowby valve..:)
Thanks in Advance!
Colin
86 5000 CD Quattro
still :^)