port matching the intake manifold?

Anti-reversion yeah thats what the old Hot Rod writers were talking about, I seen it talked about many times and always seen thats its fine for the intake manifold ports to be alittle smaller-they even said its better. Anti-reversion where the piston trys to push the intake charge back in to the manifold when the cam is big and the rpm's are slow.

As for the gas building up that might very well happen and I bet this gas today does not burn as good as 25 years ago when everybody had carbs. Now the F. I. sprays the gas in a fine mist so it still burns good but when its in a carb the gas is not in a fine mist. This may be why I notice a nice improvement when I upgrade my msd 6 box to a msd 7al two years ago. All I know is these new cars have 1 coil firing one or two spark plugs and here we are trying to fire 8 plugs with 1 coil. It can be done but not with the stock Mopar stuff. I also notice Mopar does sell the msd 7al box with the Mopar name on it but they claim its "drag race" only, I say BS.