It's not mine and I don't have personal experience with that car but if it were mine,
I'd remove the fuel filter and backflush it with anhydrous methanol or ethanol
to get the water out of it. Use plenty of alcohol and let it dry before
reinstalling it. (Maybe dry compressed air.)

As far as the steel bolt,aluminum block and head problem I think I would use
marine grease as a thread lube and hole filler so water can't infiltrate either
the threads or the area around the shank of the bolt. The excess will extrude out
as you tighten the bolts.
--
George Downs Bartlesville, Heart of the USA!