Here's a breakdown to help you decide:
Factors to Consider:
* Budget: A rebuilt original engine will be the cheapest option, while a high-performance crate engine can cost thousands.
* Performance Goals: Are you looking for stock performance, mild improvements, or all-out muscle car power?
* Drivability: A larger, more powerful engine might be less street-friendly than a smaller, more efficient one.
* Reliability: Some engines are known for their reliability, while others require more maintenance.
Engine Options:
* Original Replacement (Rebuild): Rebuilding the original engine (likely a small-block Chevy V8) is the most cost-effective way to keep it original. This is a good choice if you want a reliable, relatively simple engine that's true to the car's history.
* Small-Block Chevy V8 (350 or 400): These are readily available, relatively inexpensive, and highly tunable. A 350 is a good balance of power and drivability, while a 400 offers more torque. Many performance parts are available for these engines.
* Big-Block Chevy V8 (454 or 427): These offer immense power but are heavier, less fuel-efficient, and require more modifications to the car's chassis and suspension. They're a great choice if you're going for maximum horsepower.
* LS-series V8 (GM): These modern engines are incredibly powerful, efficient, and relatively lightweight. However, they require significant modifications to fit and are a more expensive option.
* Other V8s (Ford, Mopar, etc.): While less common in Cutlasses, other V8s can be swapped in, but this often requires more fabrication and custom work.
Recommendation:
For a balance of cost, performance, and availability, a rebuilt or performance-enhanced 350 small-block Chevy V8 is often a popular choice for 1972 Cutlasses. It's relatively easy to work on, has a wide range of readily available parts, and provides a good performance upgrade without being overly extreme.
Before making a decision, research the different engine options, consider your budget, and think about how you intend to use the car. Talking to experienced Oldsmobile or muscle car enthusiasts can also be invaluable.
