When I did a valve job on my 616 head (under the watchful eye of my import indy buddy) I was told to fill the ports with solvent and leave it for a few hours, which is what you did. You might try just lapping them. Then try the "solvent soak", Whata ya got too lose

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"