If you have a stock-cammed low-compression 318, and want your grocery getter to be a lil more fun; I highly recommend a minimum 2400 stall. which is about the rpm of peak torque in these engines.
Mine was a lil more than a grocery getter, and I installed a 2800. With 3.23s this cruised 65= 2850, so in my mind, it was an ideal marriage.
I was NEVER sorry.