I will buy the Dorman Help 55101 GM Choke Conversion Kit that you mentioned. Evnthough there are mixed reviews on the kit ( mainly difficulty on installation and that they might need to cut the bracket) this is the cheapest solution ( and I dont know any other solution
).
They are available ar Rockauto where I buy my parts. from. So this will go into the shopping cart, as soon as I order more parts..
Thanks for your help!