273 vs 318

Can't go by the stock hp specs there gross hp numbers and may have no actual relationship with the engines actual power.

And your best bet is to build 318/360 mainly more plentiful and cheaper pistons and bigger bore. And also cause of the torque factor you could gear a 273 more aggressively but most don't want and really no point since just go 318/360. To put it into perspective 4.10 with a 273 would ruffly equal 3.55/318 3.23/360 and 2.74/408.