It's a very good street/strip intake manifold.
It's biggest issue is the carbs are so close to the floor of the manifold.
The last one I did we made a 1 inch spacer to go between the base and the top. It made a difference not only in power but tuning. It took less jet to make the same power.
If you have a company local to you that can water jet materiel, take them a gasket and have them make a 1 inch spacer. If you have the room to close the hood.
The other thing is do NOT undercarb the engine. We used two 650 carbs and they were too small. We should have used 750's but the customer was on the web and all the keyboard gurus told him 750's were too big, but I doubt any of them ever ran any 2x4 anything in their lives.
