Edelbrock E-Street vs Performer RPM Heads

could you tell a major difference in power?
In my small block?
Oh freaking hell yea.
I went from a stock port 2.02/1.60 iron J head to the RPM. Intake was a LD-340, carb a TQ, headers were hooker super comp (1-3/4) slugs at zero deck, 9.9-1 ratio, up 1 point with the head change. Cam, 292/.509. 4spd-4.10 E body Cuda.
This cam didn’t take advantage of the heads flow ability with that tiny .509 lift. Taking advantage of it later was nice.