Switched from Scumacher try-Ys to Pro Parts step headers.

68dodge said
You changed the main body on the carb, so how much more air and fuel are you getting compared to the Holley? That will make a difference right there. It just like changing to bigger jets and installing a larger venturi diameter. Your motor may have needed the different fuel and air ratio with the cnc ported heads. I can not see anywhere close to an 80% gain. I run a .030 over 440 with 10.5 compression with an Edelbrock RPM cam and heads, with a Quick fuel 850 with Schumacher headers and still run 11.50s@117mph. Your test should have been done before you changed anything.

I did not change the parts in order to run a test. I changed the parts because I wanted to make the car faster. Just sharing the results, that's all. If I had a dyno at my disposal or lived very close to a drag strip I likely would have changed one at a time but it's a 2.5 hour drive to the track for me so I only go two to four times a year and my goal is always to run as quick and fast as possible.