Any 318 Performance tips?

Decided against the 383 eh?
I would just stick the 318 in as is with the parts you have and run it.
If you start opening up the engine to change the cam and do some mild porting, then it usually snowballs into springs, valve seals, shaving the heads for more compression, etc. etc.
Save all of the money you will spend and do it all at once down the road with some better heads, bigger valves, etc.
That's what i would do, i made the same mistake several times.