I disagree with the 307 or a 305 being the worst engine.  The 307 in my 69 ran just fine with 106,000 miles on it.  It didn't smoke, tick, knock, nothing.  In fact the only thing I may do to it s freshen it up with a new timing chain, oil pump, and maybe a rering kit if I think it needs it.  The heads obviously need to be redone to take todays unleaded gas, but other than that I see no problems with a 307.  The 305 that i rebuilt and put in my cousins Monte Carlo, was a roller 305 and let me tell ya, that thing has some zip for being a 305, smokes the tires pretty good.  
The 267 gets my vote for the worst chevy engine ever made.

Tom

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