Found some RPO numbers for 3 327 engines, just need the fact sheets for each one now

RPO L75 327 cid 350 hp carbureted Holley 4 barrel
RPO L76 327 cid 365 hp carbureted Holley 4 barrel
RPO L84 327 cid 375 hp rochester mechanical fuel injection

Whichever way you look at it these are pretty impressive horsepower figures from a factory produced 327 from the mid 60's