I just had my 318 rebuilt for my 1968 D100 with 4-speed and I really like the cam that Comp recommended (installed):

https://www.compcams.com/xtreme-energy-206-212-hydraulic-flat-cam-for-chrysler-273-360.html

Xtreme Energy™ 206/212 Hydraulic Flat Tappet Cam for Chrysler 273-360. Very strong torque, excellent mileage and has a smooth idle.

Here is a moparts thread that helped me lean toward those lift numbers:

https://board.moparts.org/ubbthread...4/re-help-with-cam-selection-on-318.html

I am running the Edelbrock LD4B aluminum intake/600 CFM carter carb and stock iron manifolds, with dual 2-1/4" exhaust with no crossover pipe. I am very happy with my choices which keeps it appearing mostly stock with a bit more power but not so loud sound. I am running the long body Dynomax Super Turbo mufflers (2-1/4" in/out)