Engines with lack bottom end power?

Projectile Dart said
Now I am just spitballing here and of course there are a lot of factors involved besides this but wouldn't port velocity have something to do with it as well. I don't know if you have done significant porting and polishing but once you open up your ports significantly, wouldn't that slow down your port velocity down low (less than 2500 rpm) and in turn make your engine feel like a little sluggish. But as you begin to go up in your rpm range and you start getting the airflow to fill out your intake runners/ports as well as get into the ideal range for a larger cam the engine should really come alive (3000rpm +?)
In this case a "stock" engine (318,360,/6) having the small stock sized ports and intake runners would in theory have higher port velocity down low to take off from stop in 3rd gear but quickly run out of air in the higher ranges of the rpm range...
I might have explained myself a little wrong but I think my concept is correct?

I'm sure velocity comes into play but probably not with heads both have stock magnum but I do have M1 single plane compared to the 300hp crate M1 dual plane even though I'm making as much tq/hp as the M1 dual plane at 2500 rpm and more power above so seems to have no problem filling the cylinders down low, guess the M1 single plane could slow the rate of acceleration at lower rpms. There's a dyno of 5.9l short block with the 380hp crate cam topped with the older eq heads and a air gap and has very similar power curve so it seem like the M1 single plane is a decent piece at lower rpms.

Out of the 318 builds I mention a stock 2bbl with stock heads low cr and headers made 282tq @ 3000 rpm and 282tq @ 2500 and with a xe262h cam 4bbl made 335tq @ 3000 rpm now at the other extreme a fully built 477hp 318 with ported eq heads large solid cam etc.. made 355tq @ 3000 rpm and 335tq @ 2500 rpm so this engine obviously got decent velocity at low rpm to fill the cylinders.

So question is, could the velocity be good enough to make good low end torque but not good enough to accelerate through the lower rpms ?