need some input on a budget 318 build

I tried plugging some numbers into that compression calculator, its not the most user friendly is it?

But with the KB pistons your compression ratio won't be as high as you stated (11:1). On your compression calculator, you have to enter the piston head volume as -, the 5 cc figure for the KB 167's is the volume of the valve reliefs, not the value of the dome. KB 167's are also flat tops, they just have a higher compression distance to fix the pistons being down in the hole. Ideally, they would end up being 0 deck pistons. In reality, they usually still sit down in the hole a few thousandths, but they're still much closer than the stockers.

With these numbers

3.94" bore
3.31" stroke
4.18" gasket bore diameter
.039" compressed thickness
"0" for deck clearance (optimistic, its still probably a couple thousandths)
5cc piston volume (enter as negative on the CSG network calculator)
65 cc chambers

you get a compression ration of 9.4:1. If the heads are 63 cc chambers, you get 9.6:1. Compression ration with the stock pistons .059" down in the hole would be 8.7 or 8.9:1, depending on a 65 or 63 cc chamber.

I use KB's compression ratio calculator. It also will calculate your dynamic compression if you input the cam info. If you do switch, just enter the 5 cc piston volume as 5 cc's.

http://www.kb-silvolite.com/calc.php?action=comp

As far as the cam goes, I like the Lunati Voodoo series. A 60402 is a good cam for a mild/moderate street engine. A 60403 would also be a good choice, its a little more aggressive, but would help take advantage of the ported heads.