This discussion on battery venting led me to look at the battery compartment
on my '73 Ambassador.
No the battery is not vented, but the compartment seems to be sealed somewhat
since there is a plastic enclosure where the battery sits. To allow for
venting I drilled a hole in the bottom and put a 1/2 tube in it to hopefully
give the battery gas a place to escape/vent.
Others that have a battery compartment may also be able to do this easy
modification.
Bobby
'73 Ambassador