The last engine in my car had 50 miles on it before I set out on the power tour in 2014, as did the whole car from a frame off restoration. About 50 miles further, the camshaft decided to shred itself apart, I drove it another 800+ miles on 5-6 cylinders.
So my highly scientific answer is, test it further than 50 miles..
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1969 GTO. Full rotisserie restoration "completed" in 2014. 5.3L "LM7", TKO600, 3.55's out back. Big cam coming soon.
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