Short duration cams/340

A 340 @ 8.5-1 & 3.23 gears can use a cam up to something like a 218 duration @ .050 without any noticable issue in missing low end torque. I used a Crane split (with that I take duration above) in a 318 with no low end loss worth noting. Same gear ratio and stock tires I. A stock low comp '79- 318 automatic.