Suggestions for machine work on ecotec

[VULN3UTE]

I have a mate who works at an engine machine shop and he’ll do me all the work I want for cheap, what would I look to do? I’m getting ported and polished heads, machining out the valve guides for high lift, honed cylinder bore, general valve grinding and polishing, oil gallery’s polished and rotating assembly balanced. I’m just thinking out loud if anyone else has experience getting their ecotec engine machined what recommendations they have to make the engine more reliable / powerful