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Embarking seriously on the restoration of my 1976 3 1/2 Sport I find that the cylinder heads are not great. Pistons are fine but new rings are a must. Any places I should look to get these parts? Thanks

What's wrong with the heads? Unless you're very lucky and find some local-ish decent heads with all the threads intact are a bit hard to find.
All the threads can be repaired and there are cylinder head specialists who will supply and fit valve seats. There is also a decent mod of making both seats in one piece and fitting that-a sort of spectacles shape. That also fixes the common cracks between the valve seats issue.