Cheaper than dirt 318 build

So I need to pretty up the motor (obviously) so there's about 50$, rebuild kit 200$ is step one, engine will be apart so what needs done Internally should be done then at that time. What I'm getting is I should get a mild cam, and a good 2 barrel? Would a 4 barrel and intake make a big difference? (Big enough to spend the money on it?) And that's all before even getting into the electrical bits. Spark plugs, electronic ignition stuffs, coils/wires and what not. Would pistons be worth the consideration? Would my 2 and a half inch exaust I currently got work if I make the headers on the 318 hook up?
Hp wise the cam is gonna makes the biggest difference, now practically no one upgrades the cam without going 4bbl at least, a good tune and mild cam even with manifolds and a free flowing exhaust will give good results, headers nice bonus. take that 282hp 318 article I showed made 180 ish hp stock 2bbl with headers probably be around 200-210 with 4bbl, so the cam made around 70hp cause how mild the factory one is, i'm not recommending the xe262h you probably be better with the xe 250 or 256 or similar spec'd cams definitely wouldn't go bigger than the xe262h.