“……Is the Man-A-Fre 4x2 intake manifold with 4 Rochester 2G carbs a good setup for the street or is it more of a race induction??....”

The short answer is that it is a race manifold.

The thing is with a lot of the manifolds like the crossrams, tunnel rams, or the 4 deuce, 6 or even 8 deuce intake is that they were primarily designed for high RPM race applications. Things like idle quality, low and mid range throttle response were just not major concerns when they were designed.

That being said most can be made useable for the street but besides optimizing the carburetors and linkage it often involves building or changing the rest of the car around to minimize the weak points of the intake.

With either of the 2 manifolds you are looking at, the starting point would be to actually bolt the thing on and see where you are at and going from there.

The Man-A-Fre intake is basically over kill (over carbureted) for all but a very high winding deep geared, light weight car. It will likely require a “loose” (high stall) converter that would allow the engine to come up to a higher more useable RPM range before it tries to start pulling the car.

I have seen these used on the street with some success mostly because the owner had the patience to fine tune it and the car to minimize it’s shortcomings as a street intake. I have also seen these intakes for sale because the owner could just not get them dialed in to their satisfaction.