is it worth installing cam in stock 318?

Lots of great suggestions here and all will work. Here is what I used in this motor my Low dollar 318 hop-up project

Cam & lifter kit - K50052 109.97
Edelbrock valve springs - EDL 5877 - 48.00
summit double roller timing chain - 38.00

All together 196.00 to my front door from Summit.
Here is what it sounds like


with 2.76 gears and stock converter, I ran 94 mph (93.9) at the strip. I did do some head work, but your 4-speed and 3.55's should be a great help. I did this to a 120,*** miles motor....