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

i have a built 904 with the low 1st and second gears on standby.Plan was to put it in my dart and go with 2.94's First and second gears would be the equivalent to a standard trans with 3.30 rear gearIf i leave the 3.23 in it will act like 3.60 rear through the first 2 gears.
...2nd to 3rd is not a huge drop especially with a short duration cam having lots of lower rpm torque.
Such a great idea... don't know why it isn't more common?