This was back in the day.  I spun a main bearing after street racing a friend with a
66 Fairlane Convertible (and WINNING).  The landlord hated me but this was an
Opportune time for an upgrade.  What went in was another  383 but it was a 4-bbl
With better heads.  Basically a re-ring 1969 vintage 383 from a Dodge Charger.
This engine was totally stock but it ran GREAT.  That night, after getting the engine
in, I put about 200 miles on it locally and then made a 500 mile trip to see my Dad
In Pennsylvania.  Cool thing is, the trip was completely uneventful, the car was a
Blast to drive.