The .68 housing bolts up no problem im guessing the same deal with the .82 housing as there is still plenty of room there. And you will need a custom dump made up for these ones, i had mine done at $650 At CES in brisbane, including wastegate actuator bracket adjusted. This is another issue i did come across, as you will have to rotate "both" housings to get perfect balance and line up (as in compressor housing perfect in respect to the manifold, and all feed and drain holes to line up perfectly, the perfect degree) you will have to modify the wastegate actuator bracket slightly to accomodate this. Although most Experienced workshops will be able to custom one up for you. Other expereinces i found as using earls and speedflow fittings with braided lines you will find that make sure you do them up to the turbo first as you may have some fun otherwise. Ummm im thinking thats why most will go external and custom manifold as in highmount for most of these setups.
Cheers
A