A 327 Chevy Engine is a 5.4 liter engine.
A 325 Chevy Engine is a 5.3 liter engine and a Chevy 350 engine is a 5.7 liter engine.
Your 327 Liter Engine will use less gasoline and get better gas mileage than a Chevy 350 Engine which is a 5.7 liter engine.
Still the 327 engine is a pretty powerful engine and is better when it comes to gas mileage.
The 350 engine that is 5.7 liter engine is more powerful than the 327 but both are good engines.