Another Super Victor?
Do you have a build thread on this engine already? What is the bore and stroke combo? Cam specs? Etc...
I do not see a RPM being a 600hp intake as cast, but then again, a lot is why, how and where that number is made. Even after modifications, while 600hp is possible, it seems more like trying to make power with incorrect parts.
The Victor is a high RPM intake. To read a lack of power below 3500 seems normal really. This why you always hear & read to use a dual plane intake on the street with appropriate cams. If your sacking out 500+hp with a RPM, your doing good IMO. Real good.
Food for thought, if it can be applied;
#19---Smallblock Big Mouth Ports on the Dyno