heads and intake manifold set up for 318. j heads available.

I agree with the above. A good 318 intake is the LD4B or a performer.
Thiers nothing wrong with building the 318 id your just looking for a nice driver. Heck ford guys build 302s all the time. The J heads could work but if you plan on sticking with the 318 Id look for some Magnum heads off of a newer truck.