Engine: 850 T5/R 850 R engine rebuild time - what to be careful about?

[gofra]

So it turns up my 850R needs an engine rebuild. Stem seals are bad - it puffs blue from the exhaust after idling and then pressing the pedal (PCV was just cleaned). Crankcase pressure is also pretty high and I was told I'll need to change the head gasket. After picking the car up from my mechanic, he told me to just keep driving it for some time until the rebuild - I found that a bit crazy, given the symptoms, but did drive back home. The morning after, I realised I have a big leak (coolant). Took the car back to mechanic (not the same one). Turns out coolant hose connected to the turbo was pretty worn and plastic and it just gave up.

So, rebuild time it is. This was a part of the plan from the beginning - car is otherwise in great condition with bunch of new parts (including intercooler, turbo, gearbox, overhauled brakes, dressed with new alcantara, overhauled steering column, refurbished wheels etc...), I just hoped it won't be needed right away

Anyways, I'm not having the job done by renowned Volvo specialist as first planned. Really didn't like the attitude as the guy kept whining and had a surprisingly negative approach. He told me to keep driving the car which was clearly in no condition to be driven and overtightened (and I mean, REALLY overtightened) the spark plugs. I lost all trust. So, I decided to have the work done by guys that aren't Volvo specialists, but do have the tools, knowledge and experience. They've put together a bunch of engines, including numerous race car projects.

Now, my question is - are there any specifics with Volvo B5234T engines that need special attention? I'd like the job to be done by the book, within correct specs and well documented. I got time to prepare and would love to gather as much info as possible prior to start so any feedback, tips, links and general information is really appreciated.

Thank you in advance!

Frane