I just purchased a 65 LeSabre. I've never owned a Buick let alone a vehicle older then me (40 years old). The car runs good with the exception of a few minor flaws that I found. Ac compressor makes a high pitch noise when I turn it on. I noticed the belt really loose so hopefully that's an easy fix. When accelerating up hill, I hear a little rattling under the hood, but goes away as soon as I'm done climbing. And I just seen a very small oil spot on garage floor. Other then that, engine is extremely quiet, transmission shifts really smoothly, and starts up on the dime. I would like more horse power without changing the look of the engine too much. Will it be worth the trouble of taking the engine out, send heads to machine shop, replace seals/gaskets, a cam, and EFI kit?