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Can I run a 80 amp alternator without modifying the electrical system on my '68 Coronet?

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Yes. The bulkhead is the weak link & I'd suggest Nacho's 2 wire parallel bypass of it (on the main in/out wires) which is effective and very simple/easy to do. You could even hook your ammeter back up. Feed any additions (stereo/elec pump etc) from relays on the ALT side. Nacho's right that if you keep the ammeter needle at 12 o'clock (or close to it) then the ammeter is fine. The bulkhead either clean the 4 terminals (2 pair of male/female) or do the 2 wire bypass. this keeps the excessive amperage out of the bulkhead