I just rebuilt a 1946 Chief using Ollie cams, stock ignition timing, a M88 carb with Bonne throat and jet. Today it started for the first time: two priming kicks and away she went! I was a bit surprised at how easily she started the first time around. The only thing I noticed was that she popped out the exhaust quite often at idle at anything less than fully advanced: not a backfire per se but rather early exhaust opening with timing that's too late (even if stock) I suspect. Mixture looks OK from plugs and the headers did not discolor so I think I'm still within limits. I can understand the popping given the high lift/duration cam. I'm wondering though whether the ignition timing should be a bit more advanced than stock to give a smoother idle and running. Even fully advanced she did not kick back when I started it. My '39 Chief ('48 engine) with stock cams and ignition timing runs like a clock but has to have the timing retarded to start or it will break you leg.