There are a wide variety of heads\intakes that interchange from\to the FE series engines, 352, 390, 427, 428's, etc. Not ALL heads fit ALL engines, not all intakes fit all heads. It's like a 'matrix' determining which heads\intake\blocks are compatible.
There is no easy answer here. The TYPE of intake MUST match the type of heads. High riser intake will not fit medium riser heads, etc.
Got numbers? Like CAE4-F intake will or will not fit CAE6-X heads? Low, medium, high, tunnel port or WHAT kind of heads\intake you got?
"Milled" heads\intake is another can of worms. If the heads or intake are shaved 'to much' sometimes this results in a poor fit at the sealing surfaces. Things 'leak' when that happens. Buying used parts makes it really tough to determine if the heads\intake have been shaved, and by how much (if any).
Tuning Webers? Well not thats a whole new can of worms by itself, deserving of an entirely new thread unrelated as to if the intake fits or doesn't. Getting Webers 'right' is a real chore, perhaps THATS why they are constantly being 'tuned'.
I saw your original post and determined there was insuffcient information provided to speculate on an appropriate answer at that time.