with the 3.55s, my car was running around 77mph at 3300rpms. under 3000 rpm the car didn't "feel" as good. I figured this was because that is where the multi spark stopped. I have always wondered if the multi spark was really worth it. with my timming turned way down, the A/F was on the rich side during Drag Week which I tried to lean the carbs out but when I put the timing back to where it would belong the A/F would be right on
moral of the story is I don't have high dollar anything in my car, with the timing turned way down, I still managed a 9.90 at 139 and my hood blew up and broke on that pass so I'm not sure it was a full pass.
If you look at the number of small blocks running mid 9s during Drag Week you will realize the number of cars was zero and their combos didn't look to economical to me
When running with my buddy in his 52 PU we seen the same thing... when running at about 80 the engine ran smoother and got better mileage BUT what we figured is that its getting more into the torque curve and the response on the pedal was better due to the torque
