'65 dart 225 ci well type choke thermostatic coil spring

I have a '65 dart slant 6 w/ 225 ci engine. My mechanic gave up. He couldn't fix my problem. I need the 1 barrel Holley carb well type choke thermostatic coil spring and connecting rod. This part mates to the block common to the exhaust manifold and connects to the choke lever on the carb. It could be frozen. Not sure. The mechanic rebuilt carb, but problem still exists. Idles fine, but stalls when you mash accelerator. Makes sucking sound and then dies. jeffrey356.