[Tim Parker]

I have a Backdraft also with a dart based block. The 427 built by Total Engine Concepts and installed by Speed Fanatics. I had the very same problems as you describe both hot and cold. I checked timing, idle screw settings with a vacume gauge, idle speed, choke settings and still did not correct the problem. I noticed the fuel level in the site glasses were in the middle of the glass just as the instructions for my Holley Advenger carb instruction recommend. As you describe the fuel would evaporate until the level was at the bottom of the glass and percolate when hot. I went on the internet and found that the recommended level for the fuel bowels was just at the bottom of the sight glass not the middle. I set the level at the bottom of the site glass and rocked the car from side to side and gas should slosh onto the bottom of the sight glass. Now the level is correct. I did this and I have no more problems. I push the gas peddle when cold once to set the choke and car starts right up and fast idles until I kick it down. When hot I just turn the key press the start button and it starts right up. Hope this helps.