BRODIX® is happy to introduce the BM 2000™ and the BM 2006™ intake manifolds, the latest additions to the ultra successful BM series of manifolds. The professionals at BRODIX have invested many long hours on the flow bench and at the track developing these completely redesigned pieces. Both intake manifolds have a 4150 series top. The BM 2000 fits a 9.800 deck height, while the BM 2006 fits a 10.200 deck height. These new intake manifolds offer a +20 horsepower increase over virtually every other manifold in their class!

It looks like you finally made a smaller plenum intake manifold! The BM2000 and the BM2006 should help increase velocity substantially.
I have a prototype small plenum intake similar to these. On my 496 N/A it made 740hp. I, of course, have Brodix heads on the motor!