I had 246,000 on the original engine in the NA form that eventually was pulled for low compression but ran great( who know how long it could have went!). My Original milestone was to get above 300,000 but winter starting was getting to me but I got that far thru reading posts and using good ideas. In the end it was I good thing I changed it because I found the dreaded block cracks.
I now have 1000 miles on the current replacement motor(went with a low mileage military motor) that I'm still making minor adjustments on. Just a thanks to all who contribute to this forum, without it I would have never attempted my first engine swap.