ON my 1650 I too had some rounding over due to loose mounting. I was able to build mine up using the Aluminum " brazing" rods and a propane torch. I then ran a bottoming tap into the holes, and used threaded rod studs rather than bolts to ensure I had maximum thread engagement. I put a bolt in the hole while building it up as not to loose my thread start position. I didn't try to build it up too close to the bolt hole. It has held up well so far that I know of but, I haven't had the engine back out since.
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Gary
1974 1650 50A "budscub" Was my fathers
1969 125 42"
1978 1450 44A dual hydraulics
1984 782 50C dual hydraulics, waiting for vanguard
Z-force Cub cadet Zero turn
Sears '66 Suburban 10 Sears '66 Suburban 12
2 Breaking plows, 2 disc's, front blade, rear blade, Sickle bar mower, 2 decks 3pt harrow
74 "Green 100 "John" 
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