ok ive already posted a few questions about this project already but i am having some issues, i am working on a guys 84 2wd 305/700r4 chevy, well i had to re-align the timing chain and i replaced the ujoints in it, replaced-plugs,cap, and rotor. well this thing smokes blue smoke when u rev it up now. i have the timing set at 4degrees just like the emmisions tag says, well when i hook up the vacuum advance this thing has full suction at idle, can i just find a timed port and run a new line? or is it supposed to be like this? also i took it for a test drive and it has a vibration, but only when u let off the gas, never when u get on it the best i can explain it is a vvvvvvvvvrrrrrrrrrrrr sound, right after letting off the gas and u can feel it thru the floorboards too.