It's the rod bearings that tend to fail rather than the mains.  They are
smaller, thinner and less well oiled.

Rebuild it now while you have something to rebuild, if you "spin a rod
bearing" it will destroy the engine and you will be looking for a
rebuildable core, not an easy task, since many 2.1s fall victim to this
very problem.

I don't  think it gets cold enough in Anchorage for 5w/30, checking the
temps weather.com today shows 20s and 30s.  10w/40 would be better, or
even a straight 20w oil would be preferable.  5w/30 is physically very
thin and dangerous for worn bearings.

Good luck!

--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT