M-1 single plane intake on a 440 [ not a stroker ].

I dynoed the M1 and Eldelbrock Victor about 25 minutes apart on my 500" 440. Both Intakes were with in 2 or 3 numbers of each other, tq and hp from 2000 to 6500 rpm.The M1 did better until 4500 then the Victor took over.
The M1 is a good intake and a I would not hesitate to use, it in fact the Victor for what it cost was a disappointment. I expected a large power gain and it wasn't there...
I hope this helps