Replacing a Mikuni Carburetor with a Weber Carburetor

[StarquestMan]

Ok i checked the FSM and it does in fact use the top port for the HAC system and the bottom for regular vacuum advance. i couldn't confirm though that the top port advances timing by a set 5 degrees like i thought though. i'm assuming that the main vacuum advance will give more adjustment range than the top section would but like geezer101 said if the Weber does provide more vacuum then you will need to account for that. in fact im curios myself on what the best solution is since i may be using a Weber myself on my Mighty Max 4x4 that has a California emissions setup?

[BJH324JH]

Ok i checked the FSM and it does in fact use the top port for the HAC system and the bottom for regular vacuum advance. i couldn't confirm though that the top port advances timing by a set 5 degrees like i thought though. i'm assuming that the main vacuum advance will give more adjustment range than the top section would but like geezer101 said if the Weber does provide more vacuum then you will need to account for that. in fact im curios myself on what the best solution is since i may be using a Weber myself on my Mighty Max 4x4 that has a California emissions setup?

Thank you very much.