I was very happy with my Indy 4500 after I got it back from Wilson
With a smaller ported head the car ran basically the same as it did with a more ported EZ and unported manifold.
So what ever they did helped for sure. Expensive though.

1971 Plum Crazy Super Bee. 572 World Aluminum block with a Cope 727 & Dana 4.10 out back. 9.88 @ 138 with a 1.35 60 NA. Dialed back to 10.0’s. 4000 lbs with me in it.