I'm looking for some ideas with my 451, trick flow240 heads, 11:1, m1 intake, comp solid flat tappet XTQ294S-8, quickfuel 1050an carb. I bought the carb off a member here don't remember his name. Was supposed to be used very little. I tried a 750 I have and it wasn't much different. I do have another carb I could try.

Right now with the 1050 it's idling at 1650. If I lower either idle speed screw 1/4 turn it dies. With 4 corner mixture screws I have to have them only like 1/2 turn out. Timing is around 25. It don't want to start, or restart. I have to give it a lot of gas and open the throttle to get it to fire and stay running.
Vac is 11"

I want to go through the valves, but I haven't yet.