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

One more......
I had a 9.7:1 360 with 230cfm J heads on it, small solid cam, LD340, headers, 750 Holley on the dyno.
It absolutely crushed the 8:1 360 with the SM heads and XE268 cam(89hp more).

DD for this one has the TQ 17 too high, and the HP 36 too low, and peaking at a much lower rpm than it actually did(tq peak predicted 800rpm too low, hp predicted 1200rpm too low).
It also shows the tq will be 53 higher than the hp, when in reality they were within 2....... with the HP number slightly edging out the TQ.

The point being...... if you changed a bunch of entries into the program to make the results match what the motor actually made on the dyno...... it wouldn’t be a very accurate representation of what the real motor was.
So...... who knows what the modeled motor would really do on the dyno?

It’s just not consistently accurate enough for me to put any faith in it.......which is why I don’t base any decisions for planning a build on it.