I replaced the coupling with some silicone aircraft ducting. Nothing else would work without me forcing it. Keeping an eye on it to see how it holds up to auto gas.
That job was somewhat of a challenge .
I had oiled and pre oiled the engine, rebuilt the carb and went through the distributor since it was removed. Turned the key and presto the engine started right away. Only odd event was the dried out dead mouse remains that came out of the flywheel timing cutout. Boy does it sound awesome !