big block six pack on 408

Hi gang,

I have a chance to buy a complete set of six pack carbs which came from a 383. I would like to install it on the mild 408 I'm building.
I'm assuming the center carb is a big block piece, which shold be 500 cfm.
Will these carbs fit on the small block six pack intake?
Will the cfm's be overkill or suit the engine fine?

Thanks,

Antoon