Good afternoon

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I have a HO Iroc that I am having a problem with. I live in Cleveland, Tennessee and would like to find a machanic that can adjust a new carb that I put on my car. It is a reproduction of the original that was purchased at the local dealer.
The car only has 27500 miles and I put on a new carb and having some problems with top end. When I get on the car in first and second gear, and I let off, it acts like its going to die.
Also, if I get on the interstate and get up to speed, it spits and spudders when going above 55 miles an hour.
Anyway, I need to find a good mechanic to help out.
Thanks/