Either port and polish all the cylinders (which would be cheap), or just straight out bore them larger. Either way, you need new surfaces in there, or the fuel wont burn properly, and it will malfunction at such high compression ratios.
You might also want to invest in the following:
- Gaskets
- Rocker kits (valves and rods)
- New intake, including intercooler
- CPU upgrade, or tuning