My guess would be that the qualified machine shop that would bore it .090 would probably do a core check, but then again, maybe not. If the car has been used in parades for many of those 1,000 miles, and there was a problem, I suspect it would have already shown up. The biggest issue would be overheating on a street driven motor, and doing parades would bring that out quick.

The local dirt track guys were boring brand new motors +.125 then running them hard on the dirt tracks. I'm not sure I would be too concerned, unless a life on the track is a future expected outcome. Then I would probably plan on a different motor at some point. I give you permission to start building one just after the purchase of the car.