Carter AVS tuning?

Heres the deal with OE AVS carbs, the rods are 3 step and slightly longer. The covers on top are slightly domed for this reason.

You can take the flat covers of a AFB, Edel. or Carter or OE carter and swap them on and use AFB 2 step rods from Edelbrock, a old Carter strip kit from ethier the OE / MP strip kits or newer ones or the OE carbs.

The difference in carbs, from OE AVS or AFB and the newer ones mostly seen by Edelbrock are a revised fuel curcuit for use with performance cams so they'll idle better and accel off the line without leaning out badly.

Once you find the vacuum leak, if any, move to the pump shot system on the carb. Again, this unit ethier may be drilled out or swapped with an Edelbrcok unit. Make sure the ball chack or needle check is installed under it.