That's the exact kit I bought. I bought a new head because I thought the one in that kit (o-ring head) didn't have the right squish, but I could be wrong. Maybe I'll throw the old hi hi comp head back on.
So you're running the single base gasket, the hi comp head with head gasket, and then vm20 with 170 jet? I also love that you can change the jets so easily on the vm20, which was a major reason I bought it.
Might have to take the cylinder off again and remove some gaskets, and then up my main jet. It seems like itll be way too rich but who knows!
Just curious, what needle clip setting are you on? I'm on the leanest, as the richer settings made it hard to start me engine and it ran extremely rich