What type of power enrichment system does that carburetor have- - - - -mechanical metering rods, or a vacuum controlled power valve? You're going to need a way to monitor the air/fuel ratio at light throttle cruise, and also at around 10 inches of manifold vacuum or less- - - -simulating hill climbing and/or passing. A small change in the power mixture will make a huge difference in performance and engine life- - - -too rich severely compromises power, while going lean wipes out exhaust valves, spark plugs, and possibly pistons. By the time you "hear" a lean preignition/detonation noise, you're way beyond safe power mixture limits. I prefer to monitor those parameters on a chassis dyno run instead of doing a road test. Good luck!
Jerry
