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

The biggest problem with a stock BBM 400 is Compression ratio.
If you are looking to rebuild a good set of pistons is the way to go.
That matched to the heads,matched to the cam,,etc.
I had a stroked 400 to 451 with Edelbrock heads that was a beast of a engine.One of the best engines I ever owned.