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

Absolutely can be done. The question is how much money you got honey ?9 second 383 Mopar turbocharged really isn't that hard. I would think a 300 shot on an all forged 400 would kick a lot of LS chubys in the face. One of my sons friends had a pretty badass trans am late model LS drag radials headers and some bolt on stuff it was pretty damn quick for what it was and on my way to work one morning lo and behold there he was waiting at the light I really had no choice he knew me any new my son who drives an SRT Challenger I snapped him at the light and gave that old 340 everything she had I could hear him but I could never see him I let off at about 90 because we were coming into town I guess I just got lucky LOL