Edelbrock Streetmaster 318

I have one of these intakes, been trying to find a 500cfm 4 barrel to run it on my 273 daily driver. Throttle blades on a 600 won't clear unless I run a spacer which I am afraid will affect the purpose and design of the intake.
Just machine the intake like we do with the 273 intakes so we can use a late model Edelbrock.