318 Cam Maybe Not
I used a Crane cam @ 216/228-.454/.480-112 (and there matching springs) in a ‘79-318 with a new timing chain, LD4B, 600 carb, headers into a Jets exhaust. 904/3.21 gears and a stock size tire. First outting was a 15.14 in the 1/4. After tuning the ignition and carb, there was certainly more seat of the pants power found.
IMO, the cam is worth it. Inexpensive and effective. No converter change needed.