Poly Engine what was good/bad about it and why is the LA better?

There was a four barrel version of the poly 318 available 59 through 62. Had 260 hp. Besides the four barrel carb and dual exhaust, it also had a mildly hotter cam, with 248 degrees duration vs. the 240 of the 318 poly two barrel. That 248 degrees of duration, coincidentally, is that same as the later 273 four barrel.