any input would help. QUOTE]
while ProSC is right, ill try to give some basic info (im sure he knows a lot more than i do, but here are some basics i know).
visual inspection is good. get a mitivac and you can use it to test various lines. also, you can connect it to the vacuum tree and see what vac you have at idle (~18-20 in).
you can spray carb cleaner on lines, and the idle will change when you find an open line. same for using propane (i havent done that, but others have).
thats some real basic stuff (as mentioned, im sure ProSC has much more in depth info-imagine he played with the stuff more for the forced induction

i just toss out what i can.
BTW, some say the carb cleaner and propane are dangerous. i dont mind safety too much, but im still here. good luck.