ok i just put the heads on my 454. i also just purchased a Demon carb and have that on my motor as well. ok so the motor cranks just fine....initial timing is at 10....total timing i have no idea because i dont understand that whole thing.....anyway the car runs fine except she runs really really rich....the carb i have has a 4 corner adjustment.....so i break out the ole vaccumm gauge to set her mmixture and the motors vaccum IS ALL OVER THE PLACE and still blowing out black smoke. now this is where i need help.....
1. do i reset timing....i know some 454's need timing set to 8....(My 454 is basically stock...mild cam and no insane compression)
2. seeing that my motors vacumm is all over the place tha leads me to believe that i have a leak....i have looked and dont see anything that might cause this....but you have any ideas i will look into it.
3. off idol does the advance of the dist. (yes i have hei...vacumm advance) have anything to do with how rich she runs

PLEASE HELP THESE ARE THE ONLY THINGS I CAN THINK OF.....I AM SO CLOSE AND I JUST WWANT SOLID VACUMM AND A CLEAN EXHAUST
thanx guys