Edelbrck vs Trick Flow

40 cfm at 1/2 inch should be closer to a possible 80 horsepower gain, not 20 or 30.
I would agree with you, would have expected much bigger difference.
As an example i ran basically just cleaned up eddies and a flat tappet the last several years on a 10 to 1 stock stroke 360 and went right at 119 at about 3310 race weight. This with Doug’s 1 5/8 headers with bullet mufflers. 1.52-54 60 foot typically.
Swapping this stuff over to a 416 here soon. Heads will be better, same cam and headers. Hoping for a big difference, even with the small headers