I think the logical progression should be to:
First check for leaks at headers/downpipes/mufflers..
second, get the exhaust AWAY from the trunk/cabin with a proper exhaust tip, it should protrude and turn downward.
If fumes persist, THEN start sealing the trunk-tailights-cabin.
Hopefully that will save you some time and money, as it doesn't make sense changing things that don't need to be fixed.
'62 Giulietta spider --- '74 spider rolling chassis--- '64 Giulia Ti --- '6o's DUCATi 250cc cafe racer.
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