Simple question, but a VERY involved answer.

Rochester made 100's of different quadrajets set up for different applications. These have many DIFFERENT airbleeds.

One would need to know the EXACT quadrajet you are trying to use to come close to a recommendation.

There is now an excellent book (also very inexpensive) on the market concerning the modification of quadrajet carburetors by Cliff Ruggles. Publisher is SA Design. Check your local bookstore.

Very best book on carburetors for the lay mechanic that I have read in 45 plus years of working on them.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop