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

That thing made good power all around.
If you could remember or look up that cam spec, I’d appreciate it a bunch.

Well.......That was 25 years ago.
We did a lot cam testing in those things....... and I didn’t keep any notes from the particular builds.
I did them for a few years, and the basics are kind of ingrained in my head since the rules remained mostly unchanged for the whole run.
The stuff I tried was high-240’s to low-250’s, .875 lobes for all but one(the .904 cam did nothing for us in the 318) sometimes tight lash, sometimes not........ 106-109lsa.
I think for this test it got one of the bigger & wider cams(mid-250’s, 108 or 109)....... which did real good on the dyno, but didn’t race all that well on the track.
It was a little soft coming off the corners at the shortest track, and for trying to fit the car into a hole in line that might open up.
The best driving/racing cams in those things were right around [email protected].

When the rules changed to allow 360’s, we only used cams about 4-5deg bigger.