Intake
I could be wrong but I believe that when the 454 R first came out is was listed as 454 2-R for rectangular port and 454 2-O for oval ports. The performer and airgap intakes are still listed that way. If this is the case, you have the same intake as a 454-R with a RPM range of 3500-8000. The only way to be sure would be to contact Edelbrock and ask.( Tech department 1-800-416-8628 from 7:00am to 5:00pm, Monday-Friday, PST.)