engine idles great. it sputters and dies when i put it in gear. it's a 383, rpm heads, no idea on the cam. carb is a speed demon 670 m/s. the highest vac reading i get is 12 at idle. floats are good right in the middle on the sight-glasses. ignition is msd with brand new blaster 2 coil. i replaced it because i pulled the coil wire and it was full of oil. initial is 18, and total is 36. vac adv is 10º i've tried initials of 14 through 20, with 18 being the best. i found a bad plug wire and replaced it. i adjusted the carb with a best vac reading of 12 at idle and 5 in gear (right before it dies.) i read here that vac diaphrams are rated to activate around 10-12 inches? i was gonna pull the plugs to inspect but it got dark and my boys showed up with beer. any help/ideas are appreciated.