I'll try to be brief from mine and other's experiences I can pass on:
1. The out-of-the-box 4150 version w/ standard-size port sucks on a 440-type combo.
2. With a LOT of plenum rework and runner porting, the 4150 version w/ standard-size port made very good peak HP, but had a big hole in the torque curve under 4000 RPM because the plenum is BIG.
3. The out-of-the-box 4500 version could use some plenum cleanup & blending, but is a better piece than the 4150.
4. These intakes are designed as Max Wedge-sized, regardless of the runner exit sizes as cast, and seem better suited to MW ports on 500" combinations.
Carry on.