To me cowl induction has G.M. written all over it. Goes with a Ford like sequential tails on a 'vette.
I think the shakers the way to go and saving my coin...
Before you spend the money on a hood like that - I would mock up the cowl in the height you are thinking (using cardboard) and see if you can see well enough to navigate with it. I know of more than one person that is selling cowl hoods (not for S197's) because it's just too tall. One of them is an avid autocrosser - he said that he had eaten more pylons in a single event than he did for 5 previous years altogether..