my Low dollar 318 hop-up project

I hav a set of 302 heads now when using the sockets as a guide could i use the next size up on each. Say like a metric size to get more flow or wouldnt you advise that

you can start small and work your way up.... sure, sockets are just a guide. Just be careful not to loose the tulip shape in the bowl area, especially on the exhaust. Don't do anything that would divert the flow from exiting straight to the port exit on the exhaust. Turbulence is a bad thing.... re-visit the video as often as you need for reference.