Does the engine have carbs or EFI? "Choke" implies carbs, so vacuum leaks are not as big of a problem. What kind of carbs? Could be that the carbs just need tuning.
The biggest hose would probably be the one to the brake booster. That can leak also along with the hose that supplies it. The exhaust manifold would need replacing if it's cracked, but it might be fixable with just a resurface of the head-mating surface.
Do you know where the exhaust leak is? It could be at the head or at the flange to the exhaust pipe.
More details needed.
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