I have a 1973 Mach 1 with a 351 cleveland and c6 auto. I just completed a Restomod on the car after having it for almost 20 years. The car started life as a 2-barrel but I changed to a 4-barrell with the correct 73 4 barrel heads, I know its yucky open chambers. Anyway with this new motor refresh it was bored .030, Edelbrock Performer 4 barrel intake, a mild cam, and a Holley 670 cfm carb. So the issue is that the car starts and runs but is very draggy or slow with hardly any responsiveness in the throttle till 2000 rpm. Once its there the motor responds better and really responds at 3000 rpm, problem is that's 80 mph which is hard to find a road in the Ozarks to drive it on at that speed, LOL! So this is my first Mustang build and is my 30 year National Guard retirement present, from wife. I'm not really sure how it is suppose to respond but it really seems like there is something wrong. Any thoughts on what to try would be greatly appreciated. Thanks!