the the engine sound particularly whooshy... like sucking alot of air in?
i would say you could have an intake manifold leak... try getting some engine start/ether/starter fluid (can't remember what you call it there) and spray that all around your intake manifold and vacuum lines
if your idle picks up in a certain place you spray you have found your leak... fix that then try the process again
you ign timing being advanced will also up your idle... i would suggest putting it back to 10deg and see how your idle is... just try moving your dizzy ever so slowly and see how you go
let us know how you get on
