dmac - You can at least spin it, remove the caps and check one side of the bearing for witness marks on the edge. I'd have a helper pry the crank forward and back a bit as it spins.
What I don't know, is whether we should be concerned about all the main bearings, or just #5. From my machinist, only the new style Clevite #5 is located poorly. According to Butler, it is all bearings.
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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