Adding 2.02 intake to J heads

Question. Would having 2.02 intakes be beneficial to have added the 1.88 J heads on a street car? When I upgrade the cam soon, I was thinking of putting 2.02's in. I have heard that it will not be beneficial if the motor is not seeing a consistent 4000 rpm and also that it will lose bottom end. I also heard that it can add up to 20ish HP across the board. I am upgrading the 360 soon with the Xtreme 268 cam, speed pro flat-tops and 3.91's in the rear. I have less than 1,000 miles on the heads and if it doesn't give significant gains, i'll skip it.
Thanks for your thoughts!

Based upon this ^^^ scenario.

Going to 2.02" Intakes would not greatly improve power. If anything, between 1200 and 4000 RPM's, the 1.88" Intakes will perform slightly better than the 2.02" Intakes on the Street with the Comp-Cams XE-268.