I have an 850 Double Pumper on my 351 stroked to 418 and it has been on there since 1997. Works great and was built by a racing shop in Los Angles. No choke and it does run rich at low RPM but a few seconds of higher RPM and the pipes are a perfect gray. Everything in my engine was built to match what I have on it so that may be why it works so well.
Ron
