dose anyone out there know how the vacume on the 4mv carb works or where i can find a diagram for this i currently have a 1975 chevy 350 4x4 and the carb is missing parts that i know is for sure and i have a carb that went on my 1977 chevy 350 that i can put on there (it fits i already checked that out)but it has more vacume ports then there are lines on the engine. i know this is cutting into my horse power and fuels ratio so i want this fixed asap. anything will help thank    

Here a picture is worth a 1000 words. Some ports can be capped but kinda need to see what you are talking about.