Rebuilding the 350:
Pros:
* Cost: Generally less expensive than a 454 swap, especially if you do some of the work yourself.
* Authenticity: Keeps the car closer to its original configuration, which is important to some enthusiasts.
* Potentially Easier: A rebuild is a complex project, but generally less involved than an engine swap.
Cons:
* Limited Performance: A rebuilt 350, even with upgrades, won't match the power of a 454.
* Time Investment: A thorough rebuild still takes considerable time and effort.
* Unforeseen Issues: You might uncover more problems during the rebuild, driving up the cost.
Swapping in a 454:
Pros:
* Significant Performance Increase: A 454 delivers substantially more power and torque.
* More Impressive: The 454 is a desirable engine for many muscle car enthusiasts.
Cons:
* Cost: Significantly more expensive. You'll need the engine itself, plus potentially a new transmission, rear end, and various modifications to accommodate the larger engine. Professional installation adds a substantial cost.
* Complexity: A much more involved project requiring significant mechanical skills or professional help.
* Handling Changes: The extra weight and power might affect the handling of your El Camino, potentially requiring suspension upgrades.
* Authenticity Concerns: Some purists might consider a 454 swap to be inauthentic.
Decision Factors:
* Budget: How much money are you willing to spend? The 454 swap will likely cost two or three times as much as a 350 rebuild.
* Mechanical Skills: Are you comfortable working on engines yourself? A 454 swap demands more expertise than a 350 rebuild.
* Desired Performance: Do you want more power, or is the original 350's power adequate for your needs?
* Intended Use: Is this a show car, a weekend cruiser, or a drag racer? This will influence the ideal engine choice.
Recommendation:
If your budget is tight and you're comfortable working on engines, a rebuilt 350 might be the more practical choice. If you have a larger budget, desire significantly more power, and have or can acquire the necessary skills/help, the 454 swap offers a more exhilarating driving experience but at a much higher cost and complexity. Carefully weigh your priorities before making a decision. You might even consider a crate engine as a less expensive alternative to sourcing a used 454.
