Avs2 650 tuning on a 340

In my opinion a nice street 340 with a DP intake loves 750 CFM , SP keep smaller like 650. Anyway you have to live with what you have. Leaning out ( to safe gas) means you need more advance to compensate, but you dont have the VA.
A nice fast MA and a richer fuel curve gives you almost the same fuel consumption, you need less throttle for the same amount of power!
Follow the good advices from the other guys.