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Turbo Tuner (Adam) is your best bet.

Its a well tried and tested route in the 850 world to do this. There are companies offering cams with up to 10mm lift for serious power cars so higher lift cams if set up properly can be used very...

http://i791.photobucket.com/albums/yy196/pedro-fandango/Volvo/mine/BT/info/1860.jpg

That manifold should be fine to use Paul if you ditch the turbo. If I can find them on the other laptop I'll pull all the flow maps I have for the M series Superchargers. There are quite a few...

the small mercedes engines use the m42 (as I am using0 but if your not keeping the turbo, then you will need the m62 off the biger mercedes engins.

http://i301.photobucket.com/albums/nn52/HASS08/EA2509J1725.jpg
i think your trackings out?

i've seen a supercharger added to a NA car on Volvospeed, put the charger in place of the power steering...

Yes, 851 ECU does have immobiliser, although it can be disabled.

vacuum hose routing for 850's and the early 70 series
11202

If this is the one you mean matey....

Diagram for 850 engine turbo (x70 range use a different bcs)
http://i150.photobucket.com/albums/s101/bomb192uk/mbcinstallation.jpg

Yes mate it really is that simple. Oh and you need to remove the split pin from the actuator rod too.

The new one may not be set to the correct 6-8psi however.

LINK does look like a good meet

Actually.... (sorry buddy LOL)

The block drain plug is on the back of the block just behind the water pump, above the O/S driveshaft bearing clamp.
...

Had a quick look and found thishttp://volvospeed.com/vs_forum/topic/125244-electrical-schematic-for-t5r-motronic/page__p__1674821__hl__ecu+pinout__fromsearch__1#entry1674821

Blues flow the same as whites at the same 3 bar rail pressure. The above table is not correct for book flow values also some of the bosch part numbers are also incorrect. ...