SM Head Modifications on a budget

I thought the goals were more along the lines of:

What I was hoping for was to see how close we could get to 285-290cfm with the least amount of work and cost for guys that can’t afford to pay for a full port job.
But during this test we are testing things guys can do at home and probably send it out for a competition type of valve job. If we could find simple things a non head porter could do at home and get 285-290 out of it I think that would be great.