JB weld is to close up the extra block drains. There is another product, "QuickSteel" or similar that is faster. I had troubles with JB weld oozing during the curing process. Luckily it was on the engine stand, so I taped the deck surface, then rotated it 180 deg (deck side down).
Cam bearing replacement? Ummm.... the steel cams run directly on the aluminum head, like most other engines of this type too. No bearings to replace.
I don't think Clevite 77 bearings are much benefit or necessary, but I will probably get flamed for that. However, I guess that putting new bearings (OEM or Clevite) in a used short block makes sense because most sand in the oil passages would probably be gone by now, so set #2 could expect nice clean oil.
