Cheap 318 performance mods.

I tend to agree with 318willrun, weiand action plus or edelbrock performer manifold ( the weiand is probably the better intake but not much between them). Vac sec carb around 600cfm (holley or carter/edelbrock - whatever you are most familiar with for tuning purposes), headers and dual exhaust. Re-curve the distributor.
The comp XE250H works pretty well in a stock/near stock 318. Much bigger on the cam and you should probably look at bumping the compression ratio up a bit.