Gabriel, another "Thanks" for taking the time to test and report. I bought a nos Zenith O-10355 (originally sold as a replacement for a 1937 ~ 1942 Chevrolet 216) from carbking to run on my 1951, 216 powered 3600. I have only praise for this carb. All that said, I recently added a 261 engine to the flock that will likely replace the 216 currently in the '51. It has the factory Rochester and I've been on the lookout for better carburetor. Your review could cause another Daytona carb to be installed when/if the 261 hits the road.
Added in edit: just been rereading earlier post and thought I'd add a test suggestion. As you're tuning for power it's easy to rely on the "seat of the pants" dyno. Most of us do. To add another test try this. Find a quite stretch of road, either make marks on the road or just identify a stop/start point with available landmarks that allow for precise identification within a foot or so. Then set your smart phone (or stop watch) to timer function. Drive at a steady (not accelerating at all) speed of say 40 mph and when you hit your first mark, put the accelerator to the floor and start the timer. Hold it there till you hit your second mark and stop the timer. Record the time and make notes on speed, wind, temp and humidity.
You now have a baseline to compare to when making adjustments that affect power. Although not likely to be worth the trouble with our truck and power levels you can find charts to adjust weather factors back to your baseline figures so you'er doing apple to apples comparisons.
Now make one change (only), go test and time, record all results, then repeat and report
If you really want to be thorough put the Rochester back on and do a test run, then one with the Daytona.
RonR
