My 56 Thunderbird is a 312 with a manual transmission and overdrive.   The engine is stock.   It was rebuilt and I assume it was bored some amount (TBD).  I plan to update the top of the engine to 57 specs with ECZ-G or 113 heads.   I'm also in the queue for a pair of Mummert aluminum heads.   I have a current version of the Blue Thunder intake manifold with the machining for a larger distributor.  My goal is to build a street 312 with a 57+ camshaft that looks stock to the untrained eye.   I would paint the BT intake and Mummert heads red to match the engine.   John Mummert suggests using 59 and later distributors vs a 57.   Ideally, I would like to use a stock looking distributor that has a mechanical tach drive that connects to the Tbird tach.   But I'm open to anything.  Thoughts appreciated!