I gotta be honest, they look like the same damn intake minus the pad and lack of carb stud mounting choices for a Carter carb.
I just got off the phone with a Holley tech and he said the Stealth and Action-Plus are the same identical intake. The Stealth tho has longer internal runners which get that extra 800 RPMs but the carb pad is identical. Im about 100% sure that i will go with the Stealth and have it machined to match the cutout of the Action-Plus....