I would think it would be easy to throw in a 383 gm crate motor no?
Are they hard to come by in your country? There has got to be a 350 layin around somewhere? I would try some simple things first.Have distributor curved and checked. Maybe a cracked cap/bad wires? Forgive me if you went through the easy stuff already. I know those air tubes have check vavles for vacuum in them. I had a jeep granwagoneer who had issues like this and after the emissions pump and all was removed it ran better.
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72 Lemans
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