Next parts order get a pair of these:
16 12 2 307 112 tank fuel filter socks
Amazing amount of crud rattled loose from the tank, no?
For the recoating, take the tank by ACE and get a pair of stoppers (rubber or cork) to fit the stopcock threaded nipples, and also one to fit the filler opening. Or rather, put them on the list-to-get...
'73 R60/5 Toaster