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Ender2664, aluminum heads and roller cam are really only part of the equation. You don't just install aluminum heads and a cam without a plan for the other parts affected- intake, injection or carb, horsepower needs, how the car will be used, etc..
.From your questions here on the site the last few weeks, it is obvious you need to study a bit about engines, Cobras, etc... to fully understand what you are getting into.
The best route you could take if you don't want to do the homework is to tell us (or a trusted source) what you are looking for and how you intend to use your car and trust the answers you get.
From your questions, I'm pretty convinced you really need to start out with a pretty mild 302 around 275-325 hp and get used to that before moving up to a stouter engine. Trust me, even this level of power will get your adrenaline running in a light car like a Cobra until you learn to control it. Then you can decide where you want to go with the power levels. A good track day with instructor would also be a good investment, IMHO. But I would suggest that to almost anyone who is new to Cobras - or any high performance cars in general.....
Bob
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