Weiand intake manifold ?

I have one installed on 340. With .477 lift Mechanical Lifter cam, 700 Dbl Pumper, 727 w/reverse manual valve body and 3500 stall, 4.88 gear 8-3\4 and it performs well, and engine pulled 7000 rpms all day long... i do believe the intake performed as indicated... i was surprised of the performance and the ability to work as well as it did....