I've seen A LOT of posts about making HP with a 318-So why is it so ???

Any motor that’s making at or near 1hp/ci, is a “mild” build as far as I’m concerned.

So, if you have a “mild” 318, like I described above, and it’s making in the neighborhood of 1hp/ci......it’s going to be peaking at a fairly low rpm.....almost certainly under 5500.

Your response to my proposed mild 318 was 300hp/450tq.
So, where is the extra 110ft/lbs(over stock) coming from?

The reality is....... it’s not.
There is nothing about a build like this that’s going to result in a 32% increase in TQ output.