Did you port the stock housing by any chance? The flanges that most people build exhaust manifolds with (CNC machined) do not usually match the flange on the stock housing (cast).Example..
Turbo gasket lined up on manifold flange:Turbo gasket lined up on stock housing (unported):
Then you should think through the firing order of a 4-cylinder engine. 1-3-4-2. You are pairing 1-4 and 2-3, so the outlet of each side of the divided manifold will see an exhaust pulse every 360* of crank rotation. This is true regardless which side of the turbine they are directed towards...
If your engine is healthy and the cylinders have relatively equal compression, it would be the same in either configuration. The turbine would not know the difference.
Don't run it. You need to find out what's locking it up and keeping it from spinning. Did it spin freely before you bolted the front cover onto the block? Try spinning it as you're torquing the front cover down and if you feel that resistance starts to build, you can narrow down your search and...
I can't open the link, but I'm assuming you're looking for the mustache bar/rear subframe poly bushings? If so, there's a member named boostx that was one of the few responsible for designing them and may have some available if you PM him.
Oil viscosity is, along with engine break-in, one of the most debated and sensitive topics. I'm quoting this:because I believe its the one thing to take out of all the back-and-forth bickering. If you run 10w30 and it works for your engine, great, but don't preach it to everyone as the oil...