I have the info....first hand. I have 388 with Etec 200 heads and ran on a chassis dyno. Round 1 is a big m/thumper and round 2 was an Edelbrock 2201 . Round one on the chassis dyno ran 347 ponies and 379 twist.
Round 2 came in at 380 ponies and 397 twist. All else was the same, except for a little change in tuning to match each came. The 2201, rather old school cam, gained 33 ponies and nearly 20 lb/ft, and at about 800 rpm lower than the Thu per. Also, much easier to tune and excellent street manners. Also, it idles nicely at 850 rpm. This is no dyno sim. These are real numbers.