Well You have the intake now. So prove it to your self this Saturday.
Take the aircleaner assembly off your current 6 pack set up and shut the hood wih the AiGrapper open. If you can meaure how far below th ehood the stock set up is.
Put your Weiand set up on your motor with out the air cleaner and slowly shut the hood with the airgrabber open. measure the difference.
I know for a fact my friend ran that set up on his original 70 RR 4440 6 barrel with the factory carbs and he had to make the modifications that are show in the lin above to get it to run right. I wish I still had the pictures. His air box was still in place attached to the hood but had been trimmed to get the hood to shut completely.
He also had the factory 906 heads with standard port location. I am not certain it will work with the Trick Flow or Edelbrock raised intake port heads. That is why I suggested you try it wothout the aircleaner in place first.