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1- Yep, there's a seal kit, but it's a lot of work to R&R the turbo and then rebuild it. I'd look elsewhere first.
2- It's VERY odd that it started after the new timing chain. A stretched chain can cause excess oil consumption, but if you have a new one, which should cure that! Wouldn't hurt to check the chain stretch for grins, and also the IP timing.
3- If you have odd power loss and/or surging, check ALL the plastic & rubber tubing in the engine compartment. I bought new stuff from MB (probably only $20 in parts) and rebuilt EVERYTHING, it was amazing how much was brittle or broken. If you have a leak, or slightly plugged port at the intake or switchover valve, that could cause what you describe. If all that is OK, test your turbo output, it should be 12+ psi at full load (if not, your turbo is suspect.) Finally test the ALDA with a MityVac, it should hold pressure... if it leaks as fast as you can pump, this MAY be the cause of the surging.
HTH,
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