Art,
If the thing is assembled very cautiously, if the motor is not in too wild a state of tune, if the best parts go into its assembly, if the reciprocating assembly is dynamically balanced, if the ignition & fuel system are calibrated properly on a dyno, a motor can last a very long time.
The question you may not have thought of, how over-stressed are the parts you plan to re-use? How close are they to failing already?
cowboy from hell
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