The port finish does make a huge difference.
I had not been aware of sand blasting being suitable, we always used as cast on the atmospheric engines. Superchargers might be a bit different.
I can't see a lot of work around the inlet valve seats, I suppose just increasing the bost flows wharever you want, too easy.
I am going back 30 years so things might have changed.
2001 Yamaha Zuma, DR Evo 68 cylinder, Leo Vince TT derestricted, Delorto 17.5 (#98 jet), standard aircleaner, RMS fan, Race CDI, Standard oiler and premix @ 75:1 Shell SX2, Doppler SR3 variator, RMS clutch, RMS R rear shock absorber and Pirelli SL26 tyres.