You can go with a much more efficient turbo than a BW.
I put a VS Racing 7875 Gen3 with a 1.25AR on my LS3 (376 c/i) with a single 50mm wastegate on the passenger side of the exhaust crossover (priority charge exit) and made 635rwhp (around 830hp flywheel) and the turbo nosed over at 6700rpm through a 6L80e automatic. IMO this turbo would be a fantastic size for a 400" Pontiac.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120
'66 Pontiac GTO - 389, 4 speed street cruiser
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