"GT35R" is too vague, hp ranges go from low 500s to high 800s, IIRC. So depending on the build and how much space you have, twins might be an option. For reference:
APS LS1/LS6 kit:
Custom cast manifolds:
They use T3 .84AR hot sides (50lb/min) with a .65AR compressor, times 2, for 600+whp at 8psi. And those turbos will be efficient to the upper teens, almost 20psi. Wowsors.
I believe BLU808 was using a single Turbonetics T6x (don't remember exact size) for his LS1 RX7, and the power goal for that was large.