What is the Exhaust and intake valve setting for a 2.6L mitsubishi engine?

Can anyone help me out and tell me the setting for the exhaust and intake valve for a 2.6L Mitsubishi engine, and also the correct vacuum routing diagram for the 1985 Dodge Mini Ram Van with the above mentioned engine and last question, I have a Mikuni Carburetor on the same engine mentioned above, I had it overhauled ($400.00) and can get only about 200 miles per tank fill. What's going on? Thanks for the HELP.