Jim's gonna love this one:
When I rebuilt my 235 the first time, I set the main journal clearances too tight. I cranked it up for the cam-break in. The oil pressure was really high, like 50-65 PSI revved up. Also, the temp gauge layed over to HOT in a matter of minutes. I shut it down, let it cool, then did the cam break in again.
The engine ran great for 300 miles, until the #2 and #3 main journals wiped down to the copper. The crank seized up and that was all she wrote. :o
Chip