Edelbrock LD340 Intake Manifold Usable Max RPM?

had one on a 340 12.5 to 1 worked X heads and intake was port matched and had a notch machined outta the carb base, 833 built by maccandles, 3:91 and N50's turned it 7200 some times 7400 rpms, i mighta been turning it to much, idk, but it sure was fun and car seemed to enjoy it as much as i did!