E58 400 plus HP Dart sport build

Changed out the thermostat to a 180 degrees now running about 190 to 185 degrees. I then checked timing holding at 10 degrees. I then ran up to 4000 rpm I'm at 29 degrees so seems like distributor is doing its job with mechanical advance. Seems to fall on it's face a bit right now need to adjust my kickdown as I know that's part of it. The rear gears also are factoring in pretty sure.