Twin turbo sizing for a 400 stroker? not sure on the route of 451, 471 or a 499. Left the diesel truck world and going back to gas. 1100+hp is the goal on pump gas/ e85 mix.
A pair of Borg Warner S366's would work great on that engine and would easily meet your HP goals with room to grow if you keep it 400CI.
If you go the 499CI route, I would look for a pair of 76mm turbos.
Assuming this is more of a stock block, lower budget setup?
