We have redrilled MANY Indy intakes to take a 4500 carb and done some simple blending and they worked great. When I went put a 446 out of my 67 D100 into our dragster for my kid to learn in I drilled the very same Indy intake you have from a 4150 to 4500 and did some blending. The car went from running 8.40's here in Vegas to 8.teens...
"I am not ashamed to confess I am ignorant of what I do not know."
