No problem John,
You would run all of the exhaust through the turbo.
No real need to split it.
You do not want any kind of backpressure in the exhaust system, that is an old myth that should just die.
Run a straight through type muffler, running w/out a muffler sounds like A$$ IMO.
I am pretty sure the Buick runs both banks of the exhaust through the turbocharger.
Anymore Q/s ask away.
MBHD
