CHEVY SMALL BLOCK STARTER INFORMATION
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Chevy has two basic starter bolt patterns.  Each one has it own flywheel size requirements.
The red dots are the bolt holes.  Bellhouses may have holes that fit either one. The flywheel size will determine which you will need.
Note that there are a lot of different part numbers for starters because they have various widings for torque.  In reality any starter will work fine on most street engine compression ratios.  I am doing some research now to find out which starter is the strongest.  To be announced..... if you know ... let me know!