If you were pumping 190 to 195 with the past combo, I think it would have been wise to get the 85 cc KRE D ports. The 74 is going to be pushing things with only a very small gain in power.
Location, temp, and elevation makes a big difference. The engine ran before and has a baseline to go off of, I don’t know why the builder decided it is wise to push the compression that much higher. I am a high compression guy, more than most, but I would not have went with the 74 cc versions, 85 cc would have been a better choice. After you try the 74s report back here and tell us how it’s working.
