M1, Victor340, and RPM Air Gap flow testing

There are a lot of factors to consider when choosing an intake beyond HP. Application is important as well. For a thought experiment, I used the Wallace Racing (Estimate Horsepower from Intake Airflow) program to estimate HP for each flow combination. The program lets you choose type of engine, Typ Street/Strip, Race, Super Stock, Pro Stock, and Mountain. I assigned a 0.450" and 0.500" cam the Stock Engine application. Typical Race was 0.550", SS was 0.600", PS was 0.650" and Mountain was 0.700".

Although the Race Manifolds would make more power overall in the 0.450 to 0.500" lift range, drivability and fuel consumption are more important considerations than absolute HP. These parameters need an Engine Dyno to sort out. But the rest of the applications from Typ Race to Mountain show what might be able to be accomplished with a given set of heads. Definitely matching the head air flow capability with the manifold capability is important to maximizing HP. Also not shown is the RPM range for these different applications. RPM range is also a consideration, but even with the Mountain Motor, the program calculates that the engine sould operate in the 4800 to 6400 RPM range. That is reasonable. But Cam Selection dictates a llot of the paramaters of the engine and application as well.
All this is very interesting, but you still have to build the engine which means all pieces must work togethr.