Have got a corvair with mid-engine 350, got a serious bucking problem at cruise..
holley 650, points style distributor, 4-speed manual.. very light car..
it idles fine, accelerates fine (even when you bunch it.), at cruise 2000-4000
car bucks pretty bad at times, the least bit of acceleration clears it out, but
at 45 mph drives you nuts, cuts into unpper rpms as you accelerate.
no kick-back on starter when you crank it.. no pinging on acceleration, no
(only thing off the vacuum is the vacuum advance)..