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It is fairly easy to tell... if you know what you are lookng for. As Dugly mentioned, they can tell quite a bit from the casting numbers: the date codes and engineering numbers. The engines are the same exact size externally.
The 6-bolt block began production in around July of '64 for the '65 model year. Prior to that, they were all 5-bolt blocks. If I remember correctly, the '68 model year was when the 302 went into production., though some of those blocks became 289 engines... they were using up older parts.
You have my number... call me and we can go over this in detail, if you want.
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Paul
Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
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