What can I do to make my 318 faster

You REALLY should check out the "best 273 and 318 builds" thread, there are tons of good ideas there.
A good cheap one is swapping heads. Even wrecking yard heads can offer HUGE gains. the easiest is just dropping some used stock 360 heads on it along with some used headers and a 4bbl carb. The open chamber heads KILL your compression, but the flow improvement, along with the headers and carb can put you at an honest 300hp which is plenty enough to have a tire boiling good time in any a-body.