Hey smart engine guys... can you help me?

A smart engine guy, I am not , but I can read the manual. Here`s some cam spec`s from the 68 Chrysler service manual for your 340.

Intake Exhaust Lift
276* 284* 453" at 0 lash manual

268* 276* 444" at 0 lash auto

The manual transmission does have a little "more" cam.