Depends on the gas station around here. 91-93. at roughly 1000' altitude. Keep in mind I build distributors for a living, so timing setup is easy to avoid pinging. The motor in our race truck is over 15:1.
Erick, stop looking to buy someone else's problems. By the time you give up tuning, you will have spent more than buying new. The 38/38 won't give you timing issues like the 40's or 45's.
I'm interested in tuning, I'm not interested in bolting on a 38/38. I want side drafts so I have a toy to play with. I understand that the 38/38 is simpler to deal with, cheaper, and probably would even perform better since it would be better tuned. I am not interested in a 32/36, 38/38 or hitachi. They just aren't very interesting.
If I do end up buying someone else's problems, I will not "give up" tuning, I will enjoy it! That's the plan at least. I have a company vehicle for work, so my datsun is a fun project and not my daily, so it's OK if I get a pair of side drafts and tune them for months before it's drivable. That being said, I'll wait till after Canby so I can show up in my 620.
In what way does a dcoe carb cause timing issues?