Yes 8 is way to much. 4 is plenty with a blue pump and regulator because it is constant. You can always put a mechanical on it and adjust the carb as follows. The idle screw needs to be set until the throttle plates open a tiny bit. Then adjust the air fuel mixture at 2 1/2 turns if it's a edelbrock or carter and 7/8 of a turn if it's a holley. Hopefully the timing is adjusted, if not set it at about 9 degrees before top dead center, a happy place. Mopar small blocks love lots of vacuum advance at a idle but too much will ruin the engine and idle characteristics. Most say to set the total advance at 35 degrees no more than 36. Most of my mopar hot rods have run best at 28 to 32 degrees. This information is based on a mild street build. If you have a wild high compression (more than 11 to 1 ratio) and a high stall and big thumping cam, it will need to be all set by dyno unless you are a "wizard mechanic"
