TGVs would help a bit with flow... but really, I think you're looking at forged pistons and/or head work to really take the next step. You need more air & fuel in there... which means more flow and/or more boost.
You could just crank the boost up and try to jam more fuel in there to keep things from detonating... but I'd be worried about the pistons. You're right at what I'd call the safe limit for a stock bottom end. Sure some people make 400+ whp on a stock shortblock, but that's pushing it IMO.
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