1 3/4" headers
No worries. Find old headers or exhaust manifolds from someone. Watch your engine temp! Stop running the engine if it gets to 200*, let it cool down.
If you can, get the carb looked at and tuned (as well as you can) before it runs on the engine.
I broke in a few coated headers following the above. The heat from the engine when it becomes to hot, AKA overheating, will bake the coating right off.