[Gaz64]

I run a 1405 on one of my other Holden 308s, Edelbrocks are pretty good out of the box, but like any carb will need tuning to match the needs of the engine.

Can I assume the 1806 is a AVS carb unlike the AFB style of the 1405/1406?

Have you got a "tuning kit"?

My carb is 6 years old and still has a perfect accelerator pump, maybe your carb is a little lean everywhere and now it is showing as the engine carbons up.