finally a worth while post!
the stock crank cannot be fixed, trued wleded yes, but not rebuilt.
to make it a longrod you buy a long rod crank, to make it a stroker you buy a stroker crank. or you can buy a longrod stroker crank.
i answered Q 3 already.
wisecos no doubt.
porting to match your crank if you go stroker.
any more just post back.