Can a 400BBM w/cheap aluminum heads compete/dominate against the street LS?

This...

seems like $$ pressure management $$ is computer controlled expensive;

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Is incorrect since, 1, you don’t need high pressure, 2. You don’t need a computer to control boost levels, 3. You can still use a carb. While a custom made boost friendly carb is pricey, there easily rebuilt way down the road vs a fuel injection set up.

Also your description of what I asked about what is competitive was more directed to an ET or known power FACTUAL level of the competition. Not what there driving.