I am trying to time my 350 in my 77. I set the idle at 700 like it says to, and pulled and plugged the vac advance, and hooked up the timing light. Well, it woun't run at 8 degrees BTDC. It only runs way advanced. Like about 30 BTDC. Whats going on. I need to get this thing going soon. Also, I was runnng it at around 30 BTDC for a while, but at that advance I can't get the carb adjusted and it runs like crap all the time.