Actually, most specs are milder on my engine because it's built to Stock class IHRA crate motor specs. But I'm just offering my opinion that some of the components are hurting the car's performance because the aren't working with the rest. You will be somewhat restricted with pump gas and 4.10 gears, but you appear to be bogging the engine with the trans brake and big carb. (I haven't seen the video.) It may be possible to tune a 750 double pumper to leave better footbraking, but it takes time Not enough air velocity and torque with the big carb and not enough gear to let the engine rev fast enough under load.